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Home Theater => Audio => Amplifier => Topic started by: Yahoo! on May 09, 2004 at 12:38 AM
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I recently bought a Sansui AU-D607 amplifier from pier, got it for 3.5K. They said they already have the two 907 model but they are still in the works fixing them, according to them its the 907 Limited model. My problem now is the speakers to pair with it. Anybody knows the exact power output of my purchased amp? I would like to pair it with two sets of speakers, a pair for the fronts and the other pair for the rear. I am open for suggestions... Thanks.
BTW, am also eyeing the Sony 333ESX II to pair it with another surplus Sony CD player. How does this Sony model perform compared with the Sansui AU-D607?
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I recently bought a Sansui AU-D607 amplifier from pier, got it for 3.5K. ...Anybody knows the exact power output of my purchased amp? BTW, am also eyeing the Sony 333ESX II to pair it with another surplus Sony CD player. How does this Sony model perform compared with the Sansui AU-D607?
AU-D607 is 80wpc RMS although some premium models of this line go down to 50wpc. Having owned several brands of amps - US-, British-, Canadian- and German-made (since used hifi trading was my sideline while working for a graduate degree in Diliman during the '80s), I'd say Sansui amps are among the best produced by Japan and definitely superior to comparable amps from Sony, or other popular brands.
The only Japanese brand that beats Sansui, based on my experience, is Accuphase/Kensonic Lab. If you want to invest in Sansui, upgrade with the Alpha series, which is significantly superior (more expensive too.) But then, if you can find an Accuphase amp at the pier, as long is it's in working condition and costs less than $500, grab it. It's almost as good as gold!
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thanks man. my brother is leaving for Japan on wednesday, I can ask him to look for the alpha Sansuis. My cousin will be back end of May for a month long vacation, maybe by that time my brother has found one to send back home. Better yet, I can also ask for the other great Japan amps that fellow PDVDers mention. do you any more brands you can suggest?
thanks again!
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many people say that once upon a time sansui was the greatest... some of their finest amps were unfortunately seen only in the japanese domestic market.
sansui 07 series (http://page.freett.com/knisi/sansui07.htm) (1976-1999)
(http://img37.ac.yahoo.co.jp/users/2/0/4/4/kazu25250-img600x450-10839420671.jpg)
got P100,000 to spare for this 2nd hand amp? its a bargain since the original price is P200,000.
here's an interesting comparison (http://www.sansui.us/issues_AU111vsAL907MR.htm) between a tube amp they made in 1966 and a solid state amp they made in 1995 -- they sound almost identical 30 years apart!! i don't know if i should be amazed at the tube amp for standing up to technology 30 years into the future, or the modern day solid state amp for sounding like a vintage tube amp... either way its a great achievement.
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Dont be amazed...hehehe...I had a Sansui AU 111...nothing fancy about it, except for its sheer weight at a back breaking 60 pounds !!! its Push Pull amp with 6L6 tubes ... I sounded great compared to most of my solid state amp, but once I got the Dynaco and the Scott...it was no comparison...
BTW..the AU 111 has quite a good following in the US SANSUI groups..kinda like the following of Wiredstate Members and the Dynaco ST70, several people offered to buy the unit from me, but the shipping cost was outrageous
comparison[/url] between a tube amp they made in 1966 and a solid state amp they made in 1995 -- they sound almost identical 30 years apart!! i don't know if i should be amazed at the tube amp for standing up to technology 30 years into the future, or the modern day solid state amp for sounding like a vintage tube amp... either way its a great achievement.
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I have a defective Sansui amp
model 4900Z Digital Synthesizer DC Stereo Receiver
250 watts, 220 v
acquired locally early 80's. problem the last time was umusok yung board I think due to overload.
Can somebody recommend a shop or person (preferably Makati, Pque, Alabang area) who can restore this amp back to life. Any help will be greatly appreciated. Thank you.
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I have a defective Sansui amp
model 4900Z Digital Synthesizer DC Stereo Receiver
250 watts, 220 v
acquired locally early 80's. problem the last time was umusok yung board I think due to overload.
Can somebody recommend a shop or person (preferably Makati, Pque, Alabang area) who can restore this amp back to life. Any help will be greatly appreciated. Thank you.
Hindi ko alam kung open pa ung service center nila sa may VV Soliven sa May Edsa before kang dumating ng SEC
kung galing ka ng cubao.
Pero mine(Last yr lang), I have tried Pioneer service center(6th ave Kalookan), prob ang mahal ng parts ng Sansui mukhang mas mura kumpara kung bibili ng bago. Pero still I gamble since different ang sound compare sa mga modern amp.
Ang isa pang malaking prob, pag vintage for sure hindi readily available ang parts. It will take almost a year pag nag order pa sa Japan ang parts na defective.
Pero at least nagawa and Sad to say ang brother ko ang nage-enjoy ngayon.
Cheers.
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Pero mine(Last yr lang), I have tried Pioneer service center(6th ave Kalookan), prob ang mahal ng parts ng Sansui mukhang mas mura kumpara kung bibili ng bago. Pero still I gamble since different ang sound compare sa mga modern amp.
Thanks a lot :) ...... will try Pioneer service center at Alabang.... nearer to my place
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Do they (607, 707 and 907 assuming from the same range) have the same preamp section?
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san ko ba pwede makita power output ng sansui A-5? at san kaya pwede ito pa-service?
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i would buy a 100V Jap amp at twice the price of the same model with 220V power supply. the AU series, especially Jap domestic models, have significantly superior parts than their international versions. bottom line: quality of surplus Jap amps is higher compared with those they sold to the international market.
some of the original technicians trained by Sansui Japan in the '80s (formerly with the Sansui service center in VV Soliven) were still around the last time i had one of my gear repaired, which was 10 years ago. i remember i saw one at a Virra Mall repair shop, and several were working in electronic service shops near the corner of Del Monte and Banawe. i just don't know if they're still there.
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mga sir, i need your opinion po:
a first cousin of mine is proposing to trade his Sansui AU-D7 Integrated Amp. that he bought in Saudi Arabia sometime in 1982 (but still in great working condidtion, never been repaired) w/ my Yamaha RX-V450 HT Receiver that I bought a year ago for Php14,+++ :)
tanong ko lang sana if this is a good vintage amp., magkano kaya ang resale value nito ngayon & kung di ba masyado naman akong lugi sa proposal nya, hehehe ;D
thanks a lot in advance 8)
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AU-D7 is 80wpc and equivalent to Jap model AU-D607F, which you can buy at the pier probably from P3.5K to P5K. since the AU-D7 is an international model, it's parts are expected to be slightly inferior to the D607, and that would also have a bearing on the pricing. there's a possibility, however, that the 607 unit sold at the pier was already repaired, so, another consideration. bottom line is decide based on your priority. sound, looks, price appraisal, serviceability, etc.
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AU-D7 is 80wpc and equivalent to Jap model AU-D607F, which you can buy at the pier probably from P3.5K to P5K. since the AU-D7 is an international model, it's parts are expected to be slightly inferior to the D607, and that would also have a bearing on the pricing. there's a possibility, however, that the 607 unit sold at the pier was already repaired, so, another consideration. bottom line is decide based on your priority. sound, looks, price appraisal, serviceability, etc.
thanks a lot sir sandawa for a very enlightening inputs :D.......luging-lugi pala ako dito, will just politely decline the offer nalang ;D.......salamat uli sir & may your tribe increase 8)
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from my own experience having run a repair shop in the early 80's Sansuis' bought is Saudi are not that good quality judging from the number of units that came to my shop, i's say 3 out of 5 amps would be Sansui's.
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A relative from abroad just sent me a sansui AU-11000. Do anybody here knows its full specs? Tnx! ;D
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if the Philippines had a total of
10,000 Sansui amp from Saudi
100 Pioneer amps from Saudi
30 Sansui amp were defective
20 Pioneer amp were defective
total of 50 defective amps..
Given this scenario which is the more reliable amplifier ?
from my own experience having run a repair shop in the early 80's Sansuis' bought is Saudi are not that good quality judging from the number of units that came to my shop, i's say 3 out of 5 amps would be Sansui's.
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A relative from abroad just sent me a sansui AU-11000. Do anybody here knows its full specs? Tnx! ;D
assuming it's working A-okay (pref. with new caps), you're a lucky guy! that's a Sansui mid-70s classic. 110wpc currently selling in US auctions at $300, and in Japan at roughly 25,000 yen. was sold in the US in late '70s at $750, a huge amount of money at that time. that would be an object of envy among Sansui vintage nuts at Audio Karma.
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if the Philippines had a total of
10,000 Sansui amp from Saudi
100 Pioneer amps from Saudi
30 Sansui amp were defective
20 Pioneer amp were defective
total of 50 defective amps..
Given this scenario which is the more reliable amplifier ?
unfortunately, i am unable to respond to if's, i am merely relating my experience, sansui's brought in from saudi, the one's with gray plastic sidings were prone to getting fried. this was probably because buyers were led to believe that these amps were high powered amps and thus these amps were often abused.
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Mahirap kasi mag generalize, earlier you mentioned that Sansui from Saudi were unreliable or sirain, now its only the models with gray plastic sidings, maybe later later we coulds say that a specific series of Sansui were unreliable
eto hindi if, its a fact ... yung electronic shop ng friend ko tambak ng Sony TV na sira, shall we say that Sony TV's are not good quality ? actually yung TV ko Sony mey sira rin..needs to visit that shop, yung TV ng mommy ko Sony din, nasira na rin before, yung Projection TV ni Kato, one of the members here sira rin ... napak unreliable ng Sony talaga...I bet, most of the TV that you repaired in the 80, if you did repair TV', eh Sony din ang marami. bibili na lang ako ng Konka TV, kasi sa repair shop ng friend ko, wala pa ako nakita na konka... .....Peace ;D ;D ;D ;D ;D ;D ;D
unfortunately, i am unable to respond to if's, i am merely relating my experience, sansui's brought in from saudi, the one's with gray plastic sidings were prone to getting fried. this was probably because buyers were led to believe that these amps were high powered amps and thus these amps were often abused.
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A relative from abroad just sent me a sansui AU-11000. Do anybody here knows its full specs? Tnx! ;D
hi carlos888,
sir, nakita ko ata yan sa store nyo. unfortunately, was not able to audition it. lunch time kasi, dami cd hunters. is it in tip top condition? ;D . it has the same RMS rating as my BA-2000 power amp.
this might help
http://www.sansui.us/Bro_1.htm
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Tnx Sandawa and southpeak! Its in top condition everyting is working and in original markings as well as all the knobs and switches. And sound astonishingly outstanding than my pre-power im currently using!!! ;D
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Anybody, who owns and familiar with AU-9500? Can somebody share his share of knowledge about this receiver?
Thanks in advance?
:) :) :)
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AU-9500 is another vintage gem, and comparatively rare here. released in 1975, 55wpc, original retail price at $550, current eBay price at $150. i think the best way to find more info about it is through Google, visit the sansui.us website, or search the Audio Karma sansui forum.
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Thanks, Sandawa.
Got my AU-9500 two three years ago..I replaced some leaky transistors in the preamp section because one channel was muting when played afted a few minutes of playback.
Its working well now...
Thanks again. :) :) :)
BTW, can you recommend somebody familiar with a maranz 4400 receiver, the scope is not working...
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i've been based here in Davao the last 10 years and i noticed the old hifi technicians in Metro Manila are no longer there. dati may magagaling dyan na matatanda (Japan-trained) sa Delmonte/Banaue, Raon and even Greenhills. i remember, some of them were even pirated by Middle East hifi dealers in the '80s. the last time i went around those places two years ago, wala na -- either nag-abroad, nag-retire, or SLN.
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Tnx Sandawa and southpeak! Its in top condition everyting is working and in original markings as well as all the knobs and switches. And sound astonishingly outstanding than my pre-power im currently using!!! ;D
hi carlos888, good for you. never under estimate the "sansui sound". once upon a time, it was "up" there ;). its not everyday the you become the most popular and most talked about brand in audiokarma for nothing. enjoy.. ;D ;D
http://audiokarma.org/forums/index.php?
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I have a Sansui AU-D907F. I have never regretted this purchase even when I heard tube amps - Dynaco, Scott, Fisher etc.
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I also own a 907F, the equivalent of AU-D11 which was Sansui TOTL in the US in early '80s. Check its innard, the aluminum tube coolers, 80,000uF power caps, copper chassis, etc. -- medyo short lang sa bass sabi nung iba but the sound is comparable in clarity to an Accuphase.
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guys pls help. My father owns an AUD33. Tried it pero yung red led sa taas ng power switch keep blinking lang. Probably may problem ito or sira since naaalala ko dapat tumigil yun before a sound will come out. Any idea kung san ko pwede patignan and do you think worthy pa ba syang pagawa. Any feedback on this model? Btw, may kasama syang rg7 equalizer, tape deck na i think di na talaga gumagana noon pa and a tuner na medyo sira na rin.
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marami din palang sansui lover dito. nadispose kona lahat ng sansui reciever at amp ko...and never akong nagsisi sa pagbili... ibang category tumunog ang mga sansui... nanghihinayang nga akong na ibenta ko sila...( qrx 9001 qrx 5500, aud-11, at 9090db) ang possession ko na lang ay yung hard to find na speaker model SP-5500 at SP-2000
:'( :'( :'(
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I also own a 907F, the equivalent of AU-D11 which was Sansui TOTL in the US in early '80s. Check its innard, the aluminum tube coolers, 80,000uF power caps, copper chassis, etc. -- medyo short lang sa bass sabi nung iba but the sound is comparable in clarity to an Accuphase.
Sir Sandawa,
I have not noticed that the 907F was short in the bass at all. Yup ganda talaga nung innards nung 907F - although originally when I first saw it at the Pier I thought it sucks. Buti na lang I was with someone who knew better. Nung pinatugtog iyung amp ang ganda tumunog kahit di gaano kaganda speakers. After that I made the purchase.
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this is because one man's experience on the same gear does not nescessarilly go the same as far as yours.
you may not be using the same setup overall, that is why.....
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i have noticed that amps from japan goes thru a "fad cycle" that is you see various brands that uses the same topology in a given period of time. even transistors used are the same from brand to brand, and that is easy to understand.
for sansui fans, just be warry of those models that have these plastic sidings, phenolic underchassis cover and grey metal top covers, they are lemons imho and you are better off avoiding them.
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for sansui fans, just be warry of those models that have these plastic sidings, phenolic underchassis cover and grey metal top covers, they are lemons imho and you are better off avoiding them.
Sir 2ny, baka may specific model numbers/range kayo niyan? I've seen sa pier na gray plastic ang body with the newer sansui logo. Ayan kaya yun? ???
As for me, back in the early 80's as a kid we had a complete Sansui system; amp, two tape decks, tuner, equ, tt, speakers, hindi ko nalang maalala yung amp model but even then I felt it was the best. Sadly my older bro sold everything off while I was away. Now all I have is an AU-D507X which, innards wise isn't as good as its higher numbered brethren; like the ones discussed earlier. However it has served me well and good. It may be a bit tired looking pero wayyyy okay parin ang tunog. So I'd still keep it even as I was able to get a very much classier Luxman. ;D
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at natuwa naman ako nung binenta mo sa akin QRX-9001, sir joey ;D pero eventually binenta ko rin dahil di ko rin naman magamit quad features nya. masaya naman siguro yung 'kano na bumili ;D
i'm still in the search for an AU-907. very rare na magkaroon nito sa pier :(
marami din palang sansui lover dito. nadispose kona lahat ng sansui reciever at amp ko...and never akong nagsisi sa pagbili... ibang category tumunog ang mga sansui... nanghihinayang nga akong na ibenta ko sila...( qrx 9001 qrx 5500, aud-11, at 9090db) ang possession ko na lang ay yung hard to find na speaker model SP-5500 at SP-2000
:'( :'( :'(
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i'm still in the search for an AU-907. very rare na magkaroon nito sa pier :(
Meron AU-D907 malapit sa White Gold Valenzuela. Paki check naman dun sa Surplus Amps iyung location. Nasabi ko na kasi dun. Walang kumukuha nung unit na iyun since last year. Bakit kaya?
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saw that post kaya lang medyo malayo sa makati and i'm not familiar with the area.
Meron AU-D907 malapit sa White Gold Valenzuela. Paki check naman dun sa Surplus Amps iyung location. Nasabi ko na kasi dun. Walang kumukuha nung unit na iyun since last year. Bakit kaya?
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at natuwa naman ako nung binenta mo sa akin QRX-9001, sir joey ;D pero eventually binenta ko rin dahil di ko rin naman magamit quad features nya. masaya naman siguro yung 'kano na bumili ;D
i'm still in the search for an AU-907. very rare na magkaroon nito sa pier :(
your welcome sir parasmi... ;D actualy madami pa ibang sansui amp ang napalampas ko dahil sa budget... fyi meron nga akong inaawitang g-22000, BA-5000, AU-111 at iba pa, kaso hindi natuloy yung deal... sa tawi-tawi pa at somewhere sa bangkal nakatago yung mga amp.. sayang talaga haaay... ??? :'(
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hi carlos888, good for you. never under estimate the "sansui sound". once upon a time, it was "up" there ;). its not everyday the you become the most popular and most talked about brand in audiokarma for nothing. enjoy.. ;D ;D
http://audiokarma.org/forums/index.php?
I agree with you!!! I never thought this amp is way up there in the sansui hierarchy. And the technology that was incorporated in this amp is evident even it todays high end amp. ;D
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mga sir, my Sansui BA 2000 is only rated at 8ohm load impedance, no mention of 4 or 6ohm in spec sheet, could i try it with my 4ohm speakers?
(http://img176.imageshack.us/img176/3512/ba01rd7.th.jpg) (http://img176.imageshack.us/my.php?image=ba01rd7.jpg) (http://img176.imageshack.us/img176/5434/ba02ua9.th.jpg) (http://img176.imageshack.us/my.php?image=ba02ua9.jpg)
maraming salamat po..
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mga sir, my Sansui BA 2000 is only rated at 8ohm load impedance, no mention of 4 or 6ohm in spec sheet, could i try it with my 4ohm speakers?
(http://img176.imageshack.us/img176/3512/ba01rd7.th.jpg) (http://img176.imageshack.us/my.php?image=ba01rd7.jpg) (http://img176.imageshack.us/img176/5434/ba02ua9.th.jpg) (http://img176.imageshack.us/my.php?image=ba02ua9.jpg)
maraming salamat po..
the fact that there is no mention of 6 or 4 ohms on the spec sheet means that the manufacturer can not guarantee operation with a 4ohm speaker. but this does not mean that you can hook up a 4ohm speaker, you can but do not operate the amps for prolonged periods and at high volume levels. hinay hinay lang....
travel at your own risk.
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the fact that there is no mention of 6 or 4 ohms on the spec sheet means that the manufacturer can not guarantee operation with a 4ohm speaker. but this does not mean that you can hook up a 4ohm speaker, you can but do not operate the amps for prolonged periods and at high volume levels. hinay hinay lang....
travel at your own risk.
copy sir, thanks for the advise. medyo lumakas ang loob ko na mag experiment. will thread lightly as suggested.
follow up question if i may. the unit is equiped with attenuator so i could hook it up to sources directly. control thru amp volume pots. but if i'm using a pre-amp, as the previous owner had suggested, i turn the volume pot of the amp to maximum and control volume thru the pre-amp. is this the proper way of operating it? em i not straining the amp too much this way?
maraming salamat po ng muli.
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ben,
to be safe, try to set the amp's volume at minimum and gradually adjust the volume of both amp/preamp to an acceptable level. be careful in adjusting the volume, you are driving low impedance load which might damage your amp! :(
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ben,
to be safe, try to set the amp's volume at minimum and gradually adjust the volume of both amp/preamp to an acceptable level. be careful in adjusting the volume, you are driving low impedance load which might damage your amp! :(
hi andy,
maraming salamat. i had a feeling i was doing something wrong. luckily i was driving 8ohm speakers when i did what i did. medyo mali nga ata na ilagay sa maximum ang volume control . will do as advised..
:)
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since were talkin about sansui, ano ba ang compatible speakers for entry-level na sansui av receiver?
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same here, my g-8700db says it can only handle 8ohm load or higher. didn't risk hooking speakers w/ low impedance.
just wondering though kung bakit pwede connect dito another pair of speakers (speaker B) rated at least 8 ohms also. Isn't that A+B 8 ohms would present a 4 ohm load to an amplifier?
mga sir, my Sansui BA 2000 is only rated at 8ohm load impedance, no mention of 4 or 6ohm in spec sheet, could i try it with my 4ohm speakers?
(http://img176.imageshack.us/img176/3512/ba01rd7.th.jpg) (http://img176.imageshack.us/my.php?image=ba01rd7.jpg) (http://img176.imageshack.us/img176/5434/ba02ua9.th.jpg) (http://img176.imageshack.us/my.php?image=ba02ua9.jpg)
maraming salamat po..
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hhhmmm....wala ba recommended setting dun sa manual, sir?
all of my power amplifiers have attenuator control. when i use a pre-amp, i usually set the attenuator at 12 o'clock
copy sir, thanks for the advise. medyo lumakas ang loob ko na mag experiment. will thread lightly as suggested.
follow up question if i may. the unit is equiped with attenuator so i could hook it up to sources directly. control thru amp volume pots. but if i'm using a pre-amp, as the previous owner had suggested, i turn the volume pot of the amp to maximum and control volume thru the pre-amp. is this the proper way of operating it? em i not straining the amp too much this way?
maraming salamat po ng muli.
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Sir 2ny, baka may specific model numbers/range kayo niyan? I've seen sa pier na gray plastic ang body with the newer sansui logo. Ayan kaya yun?
i can not now recall the model numbers, but these amps have silver facia, plastic sidings, greyish painted bodies...they ussually came from Saudi....i've repaired lots of them, Sansui's other nick name is Sansunog, because the output transistors easly burned out, as many fake transistors were being sold in Raon..
i never really had this brand loyalty so to speak, as i know their topology and that they are not really different from other brands, only that some are more robust than the others.
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Meron AU-D907 malapit sa White Gold Valenzuela. Paki check naman dun sa Surplus Amps iyung location. Nasabi ko na kasi dun. Walang kumukuha nung unit na iyun since last year. Bakit kaya?
Hi sir rascal,
had someone recently check the place in valenzuela. What they have right now is a sansui au-7500, a 607f and 607 decade. Sir, pa pm naman how much you got your 907F. Someone is offering a 907 and just wanted to check pricing. Hindi daw surplus.
Thanks,
eestrera
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Sent you PM.
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guys pls help. My father owns an AUD33. Tried it pero yung red led sa taas ng power switch keep blinking lang. Probably may problem ito or sira since naaalala ko dapat tumigil yun before a sound will come out. Any idea kung san ko pwede patignan and do you think worthy pa ba syang pagawa. Any feedback on this model? Btw, may kasama syang rg7 equalizer, tape deck na i think di na talaga gumagana noon pa and a tuner na medyo sira na rin.
Hi Sir, I have the same problem with my amp A707, from what I know, this is a result of the circuit protection unit activating because it senses something wrong in the amp to avert further damage.
"Mga masters" can you help us on the most probable cause of this problem, my amp stops after I played a few songs.
Thanks.
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can you help us on the most probable cause of this problem, my amp stops after I played a few songs.
this is due to the protection circuit being triggered and that is to protect your speakers from burning. you see, the protection circuit senses the presence of dc on the speaker terminals so that once the voltage gets dangerously high, say over 100mV, then the relay is energised opening the output.
this is also due to thermal dirfts, wherein output offsets are developed as a result of higher temps, try playing your amps at realy low levels and see if it trips.
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Hi Sir, I have the same problem with my amp A707, from what I know, this is a result of the circuit protection unit activating because it senses something wrong in the amp to avert further damage.
"Mga masters" can you help us on the most probable cause of this problem, my amp stops after I played a few songs.
Thanks.
You're right, there must be something wrong. Amps with protection circuits do not usually engage that early even at high volumes for hours under normal conditions. I had the same problem with my earliest A909 sansui amp in the early 80s. .Without any multitester, no techie to help, and very impatient to have the thing working right, I just made a gamble with my instincts and repaired BLINDLY with an old solering gun. Suspecting the power transistors due to one channel inordinately heating up more than the other, I had all the power transistors replaced. Not overly expensive anyway. And wth sheer luck, it worked fine thereafter - just an hour after I bought the parts from Raon. ;D Am not recommending it, suggest you have a techie troubleshoot it well first.
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The Red Protection lamps of my Sansui AUD707Decade kept blinking when I am using it and the source CD sends powerful bass to the amp.
The red pilot lamp would flicker and the audio ouput would cut out. After a while, the output would cut in again.
I realized later that i was using a 120 volt black step down transformer. When I replaced it with a 400 watt 100 volt transformer i bought from the Pier, the amp didn't encounter problems again.
foo.
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Input Overvoltage Protection was kicking in.
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I realized later that i was using a 120 volt black step down transformer. When I replaced it with a 400 watt 100 volt transformer i bought from the Pier, the amp didn't encounter problems again.
Jap appliances are designed for 100VAC. Never use 120VAC. Or even 110VAC.
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Hi Sir, I have the same problem with my amp A707, from what I know, this is a result of the circuit protection unit activating because it senses something wrong in the amp to avert further damage.
"Mga masters" can you help us on the most probable cause of this problem, my amp stops after I played a few songs.
Thanks.
Our experience with our present AU-55F model (those with no CD input) has something to do with CD output ... CD output has high voltage level than the earlier formats (phono & tape & aux) ... sansui with no CD input may trigger protection circuit if it received CD signal beyond its sensitivity rating where you plugged the CD player
With some DVD players (probably generic and could be some 'branded' obes), the output may not strictly subscribed to the limit of CD signal output level ... so the more it will induce sansui protection circuits ...
What to do? ... some DVD players has some sort of volume control which lowers the output signal going to your amps ... try to lower the level and experiment if you will still get the same problem.
For 120V transformer or 110V ... typically if you are not the first drop in a meralco post, chances are you are way below the meralco standard of 220Vac, probably within 200-210Vac, thus 110Vac transformer should be fine. For those near transformer, typically you may get 225-230Vac - that even your 100Vac transformer will have a hard time outputting that 100Vac ... an AVR with 100Vac may help.
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this is due to the protection circuit being triggered and that is to protect your speakers from burning. you see, the protection circuit senses the presence of dc on the speaker terminals so that once the voltage gets dangerously high, say over 100mV, then the relay is energised opening the output.
this is also due to thermal dirfts, wherein output offsets are developed as a result of higher temps, try playing your amps at realy low levels and see if it trips.
Thanks Sir Tony. I normally listen up to 8 o' clock lang. I use only a wharf D8.1 for this amp. How will I know the presence of DC in my speakers?
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You're right, there must be something wrong. Amps with protection circuits do not usually engage that early even at high volumes for hours under normal conditions. I had the same problem with my earliest A909 sansui amp in the early 80s. .Without any multitester, no techie to help, and very impatient to have the thing working right, I just made a gamble with my instincts and repaired BLINDLY with an old solering gun. Suspecting the power transistors due to one channel inordinately heating up more than the other, I had all the power transistors replaced. Not overly expensive anyway. And wth sheer luck, it worked fine thereafter - just an hour after I bought the parts from Raon. ;D Am not recommending it, suggest you have a techie troubleshoot it well first.
Hello Sir AVPhile, I think this is something I can also do or ask somebody to solder it for me. The top mark on my transistors are SK A1386 70P and SK C3519 77P. Do you have an idea how much is these transistors and where can i buy an original part?
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The Red Protection lamps of my Sansui AUD707Decade kept blinking when I am using it and the source CD sends powerful bass to the amp.
The red pilot lamp would flicker and the audio ouput would cut out. After a while, the output would cut in again.
I realized later that i was using a 120 volt black step down transformer. When I replaced it with a 400 watt 100 volt transformer i bought from the Pier, the amp didn't encounter problems again.
foo.
Sir, thanks also, I will try to measure the voltage in my outlet and the output voltage from my step down transformer. Will the same problem occur if my stepdown transformer is supplying lower than 100V?
.....And to everyone, thanks for the valued information and help, I hope I can correct the problem very soon.
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Hello Sir AVPhile, I think this is something I can also do or ask somebody to solder it for me. The top mark on my transistors are SK A1386 70P and SK C3519 77P. Do you have an idea how much is these transistors and where can i buy an original part?
Are you sure the power transistors are the culprit? Did you have it checked by a reliable techie?
If so, check out Deeco electronics in Raon and ask if they have these transistors (drop the SK label) or exact replacements (the A and C prefixes indicate matched complementary pairs for typical push pull class AB types, so are B and D) As far as price is concerned, it's been more than 20 years since I changed those Sansui power transistors so I am out of touch. ;D
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Are you sure the power transistors are the culprit? Did you have it checked by a reliable techie?
Hi Sir AvPhile, Maraming salamat po. I have not ask anybody yet to check my amp as I worry that it might do bad than good I have to know first the causes before I send it out for repair. I had an experience kasi with my sub hanggang ngayon e still under repair pa din due to parts unavailability. I enjoy using this amp very much than with my 7.1 ch that is why I am very cautious.
Anyway this is what I found out this afternoon and tonight. My Alpha 707 is rated at 360W , my AC outlet delivers 220V, I am using before a computer AVR rated at 110V, 100W but when i measured the output voltage it is only 85V in the afternoon and 90V in the evening. In this AVR, I enountered the same problem the I have with the current stepdown transformer I am using rated at 110V, 1000W (I changed it becuase I thought the problem is when I played out loud, the AVR cannot suport the power needed by the amp hence I changed it to an Xformer with higher wattage), but when I also measured the voltage it is only at 75V in the afternoon and 80V in the evening. Could this be the source of the problem (undervoltage), or something really went wrong with my amp becuase I used 110V AVR and transformer? If this is the case that i am uising 110V, what will be the normal section of the amp will be damaged?
Sir aHobbit, may amp has a cd in, kaya pwede na natin siguro i-rule out as a possible cause. Now I am really worried that I damaged my amp using 110V.
Thanks.
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I'm just curious, is your amp Sansui A707 or Sansui AU-Alpha 707? Reason for asking is I'm monitoring rare Sansuis that arrived here and Alpha 707 is comparatively rare outside Japan and Europe. Also, the Apha 707's power rating in the original version is 130wpc and 320 watts power consumption. If you have the 240V version released in Europe, it may have a higher power consumption figure.
I'm not a technician, more a listener, but if your measuring equipment is accurate, and it gives you over 10% variation in your voltage rating, you should file a complaint with your power company. Those figures would damage most of your appliances, not just the stereo system.
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Your AVR's undervoltage is below 10% of the expected values and AFAIK they can have detrimental effects on some appliances. If you measure them at 90VAC without load, expect the voltage to further drop when loaded.
I think there's also such a thing as undervoltage shutdown or lock-out in power amps if the input voltage falls below a certain value. This is entirely theory for me though as I have not experienced severe undervoltage conditions where I live. I heard that feeding motors with lower than required voltage can cause them to run overly hot as increased current is forced to compensate for prolonged voltage sag.
I would think that any undervoltage in the amp's voltage rails will have the same effect as reducing the speaker load impedance. And that is to extract more current that could cause the protection circuit to engage when it could no longer produce the needed current to amplify the signal.
But since you are using Automated Voltage Regulators, they are supposed to output the correct 100v or 110v, as the case may be. The input household voltage sag must be so severe to cause more than 10% reduction in the AVR output . See if you can up their output voltage to the proper level or borrow another that does, and if your problem recurs despite this, then it's time to turn to a repair center.
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I think your amp can not easily be destroyed by under voltage - the only thing you can do to validate if your amp is still in good condition is to try to plug it in the correct voltage and operate it and observe.
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Undervoltage condition at the input or output in my opinion is as dangerous as overvoltage because although voltage is low amp maintains same power. As such, the current increases. If it exceeds current rating of the semiconductors they will get damaged.
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Undervoltage condition at the input or output in my opinion is as dangerous as overvoltage because although voltage is low amp maintains same power. As such, the current increases. If it exceeds current rating of the semiconductors they will get damaged.
AM sorry, what power does an amp maintains?
I have made an amp ... it can be biased from 18V - 32V .. depending on how much peak power you want from it ;) ... the only problem you may encounter with low voltage is that your amp will clip earlier (DC output) which is probably why sansui will trigger it protection circuit too early (because at low voltage, clipping can occur at low volume), without the engaging of protection - amp may destroy your speaker ... not your amp ...
Typically, voltage sags during amp operations ... and low voltage can be interpreted by your amp as typical voltage sag (premature that is) ...
still need to digest what you mean 'mantains what power' thingie ... peace :)
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Ano bang voltage ang pinag-uusapan nyo? Yung galing mains or yung galing psu?
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AM sorry, what power does an amp maintains?
I have made an amp ... it can be biased from 18V - 32V .. depending on how much peak power you want from it ;) ... the only problem you may encounter with low voltage is that your amp will clip earlier (DC output) which is probably why sansui will trigger it protection circuit too early (because at low voltage, clipping can occur at low volume), without the engaging of protection - amp may destroy your speaker ... not your amp ...
Typically, voltage sags during amp operations ... and low voltage can be interpreted by your amp as typical voltage sag (premature that is) ...
still need to digest what you mean 'mantains what power' thingie ... peace :)
Say your appliance is having input power of 20W at standby position (meaning to say audio source is paused or just on). For 220Vac operation, this means input current of 91mA. When input voltage sags to 150Vac appliance will automatically draw 133.3mA to maintain standby operation. This is 42.3mA above current when input voltage is at 220Vac. This current is drawn by the appliance to maintain regulated voltage and biasing currents.
This is actually what is happening to any appliance when input voltage fluctuates. If the rectifier diodes is rated for 100mA operation only then you can expect to have them damaged in a short time without your undervoltage protection circuit.
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sir rascal... y di na u nag-mail??....
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I'm just curious, is your amp Sansui A707 or Sansui AU-Alpha 707? Reason for asking is I'm monitoring rare Sansuis that arrived here and Alpha 707 is comparatively rare outside Japan and Europe. Also, the Apha 707's power rating in the original version is 130wpc and 320 watts power consumption. If you have the 240V version released in Europe, it may have a higher power consumption figure.
I'm not a technician, more a listener, but if your measuring equipment is accurate, and it gives you over 10% variation in your voltage rating, you should file a complaint with your power company. Those figures would damage most of your appliances, not just the stereo system.
Hello Sir, it is an AU Alpha 707 (I just cant recall if its 320 or 360W power consumption), I have to check the back again and i will let you know, I bought it from a friend who also bought it from Pier. Sir the fluctuation is coming from my AVR and step down transformer and not directly from the outlet. The voltage from my outlet is in the range of 220V to 230V.
Thanks.
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But since you are using Automated Voltage Regulators, they are supposed to output the correct 100v or 110v, as the case may be. The input household voltage sag must be so severe to cause more than 10% reduction in the AVR output . See if you can up their output voltage to the proper level or borrow another that does, and if your problem recurs despite this, then it's time to turn to a repair center.
Hi Sir Avphile, I have the same feeling, I have to borrow or invest a good one. Anybody can suggest a good but not expensive brand? Hopefully this will fix my problem.
Hello Everyone, Thanks for the valued inputs.
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sir rascal... y di na u nag-mail??....
OT, kumusta sir? hehehe Bawal gamit kong proxy sa office and di pa ako nagbabayad tel sa bahay. Anong balita?
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Hello Sir, it is an AU Alpha 707 (I just cant recall if its 320 or 360W power consumption), I have to check the back again and i will let you know, I bought it from a friend who also bought it from Pier. Sir the fluctuation is coming from my AVR and step down transformer and not directly from the outlet. The voltage from my outlet is in the range of 220V to 230V.
Thanks.
Thanks for the reply. You're lucky, konti lang meron nyan. That's an excellent amp unless you got a defective one. The other I mentioned, A-707, was the Saudi-type component amp once common here, yung mga binebenta sa international market nuon that accept speakers 8 to 16 ohms only. Ang alam ko marami dun nasunog na.
I was thinking the mains was your problem since undervoltage was common to your AVR and transformer. I'm using several AVRs and transformers now and measuring outputs on a monthly basis. Since I started buying Jap vintage hifi 5 years ago, I have limited my AVR and 100V transformer choices to two brands, Zebra and Panther, but there maybe better and cheaper brands now.
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Undervoltage condition at the input or output in my opinion is as dangerous as overvoltage because although voltage is low amp maintains same power. As such, the current increases. If it exceeds current rating of the semiconductors they will get damaged.
wow, you have loaded the bases too much here!!! ;D can't make heads or tails with this statement. wonder what this can really mean.
Say your appliance is having input power of 20W at standby position (meaning to say audio source is paused or just on). For 220Vac operation, this means input current of 91mA. When input voltage sags to 150Vac appliance will automatically draw 133.3mA to maintain standby operation. This is 42.3mA above current when input voltage is at 220Vac. This current is drawn by the appliance to maintain regulated voltage and biasing currents.
This is actually what is happening to any appliance when input voltage fluctuates. If the rectifier diodes is rated for 100mA operation only then you can expect to have them damaged in a short time without your undervoltage protection circuit.
now where did you get this idea? you are way off...... ;D
The other I mentioned, A-707, was the Saudi-type component amp once common here, yung mga binebenta sa international market nuon that accept speakers 8 to 16 ohms only. Ang alam ko marami dun nasunog na.
yeah, i repaired lots and lots of them, that is why we call them, "SANSUNOG".
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wow, you have loaded the bases too much here!!! ;D can't make heads or tails with this statement. wonder what this can really mean.
now where did you get this idea? you are way off...... ;D
yeah, i repaired lots and lots of them, that is why we call them, "SANSUNOG".
You say loaded the bases and say off then what is the correct one?
Pls explain the relationship between transformer pri and sec voltages and currents. Also, why does bulk ripple increase with load?
How will I compensate for low input line voltage? Will I decrease/increase duty cycle to maintain bulk voltage?
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sorry, but comparing your posts with the topic at hand, i'd say yours wandered off....
when discussing audio electronics, sad to say, your knowlegde about smps have no place in it... ;D
to set the records straight, ohms law states E= I x R, voltage is equal to the product of resistance times the current passing thru it. i learned that in high school physics and had stuck in my head since. i do not know that that law has been changed..... ;D
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The question being asked is about the consequences of undervoltage so I tried to explain what is happening on the PSU. Doesn't matter if linear or smps.
Linear of SMPS, you still need a PSU in your amp and same principles apply.
I know that you have great experience with amps, I don't question your knowledge here but at the same time you seem to put down SMPS. Why what is so different about SMPS and amps? An SMPS designer cannot make amps and vice versa?
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to set the records straight, ohms law states E= I x R, voltage is equal to the product of resistance times the current passing thru it. i learned that in high school physics and had stuck in my head since. i do not know that that law has been changed..... ;D
that's what I also learned from our hs Physics teacher (Bless her), but what got stuck in my head was something else. :o
Kirchoff's Law that is. ;D ;D ;D
I also remember her saying "Volta" instead of "Volts". :-*
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Sir TonyT, JojoD,
Let get things straight, am not questioning Ohms Law. I have been answering what happens when input line voltage becomes low. To maintain input power so as to provide sufficient voltage and current to load, what will PSU do? This is not an Ohms Law question.
Kapag tinanong ba pangalan mo sasabihin mo taga Paranaque ka? ;D ??? ;D :)
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This is not an Ohms Law question.
Oh, isn't it? And I thought that was the basis of your assertion that current will increase if you go undervoltage. ;D
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To show you guys what I mean, on your amp or appliance monitor your input line voltage and current. You will require a voltmeter and ammeter. What happens to your input current when your input line voltage increases? What happens to your current when input line voltage decreases?
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O.T. P = E x I ata yung formula ni sir rascal101. di ko na maalala kung ohms law yun. hehehe
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Ohm's Law was never questioned at all.
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Isa pa nga,
For example on your amp,
Input power = 100W, Output power = 50W (standby)
Assuming input line voltage = 220Vac, input line current = 454.4mA, power factor = 1.
The equations are:
1. Efficiency = Pout / (Pin x power factor)
2. Power = voltage x current
Note: Pout = output power, Pin = input power
When input line voltage = 180Vac, what will be input line current to maintain output power of 50W?
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555mA?
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Very good! Correct!
Now will we see an increase in current if our input line voltage drops eg from 230Vac to 210Vac? To find out for yourself, do the experiment I mentioned.
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O.T. P = E x I ata yung formula ni sir rascal101. di ko na maalala kung ohms law yun. hehehe
Ah ok, that seems more like it. ;D I think this is Joule's law.
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rascal,
you are correct, things are straight as they are. ;D :-*
My name is Jojo and I'm from Valenzuela, not Paranaque. ;D ;D ;D J/K
Oh well, speaking of high school Physics, I now miss my Biology teacher. :o ;D
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hehe ... I'm from Bulacan ...
Sir TonyT, alam ko naman marami na kayong experience sa audio kaya kayo ang "resource person". Ako naman, sumasagot lang ako base sa experience ko. Kung ano mali ko, sabihin niyo lang pero sana samahan ng nauukol na paliwanag. Gusto ko rin naman matuto kung bakit. Huwag naman yun walang lugar SMPS sa analysis. Lahat naman tayo natututo sa isa't isa.
:)
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Linear of SMPS, you still need a PSU in your amp and same principles apply.
agreed, but you are still out of line. ;D
as i recall the discussion was about transformers for japanese amps, 100volts ac vis a vis 110volts remember? ;D
now how does the smps psu come into the picture? ;D ;D ;D
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Isa pa nga,
For example on your amp,
Input power = 100W, Output power = 50W (standby)
Assuming input line voltage = 220Vac, input line current = 454.4mA, power factor = 1.
The equations are:
1. Efficiency = Pout / (Pin x power factor)
2. Power = voltage x current
Note: Pout = output power, Pin = input power
When input line voltage = 180Vac, what will be input line current to maintain output power of 50W?
hey rascal101 for Pete's sake just cut it out, please! ;D ;D ;D :'( :'( :'(
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You didn't read the part where an undervoltage condition was being discussed.
And for Petes' sake, please read. ;D ;D ;D :'( :'( :'(
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oh didn't i? ;D by simple ohm's law reckoning, current goes down in the transformer primary when voltage decreases. ie, when voltage goes from say 120 to 100 volts, power delivery by the amp decreases proportionately... ;D this is as simple as it gets...
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Your AVR's undervoltage is below 10% of the expected values and AFAIK they can have detrimental effects on some appliances. If you measure them at 90VAC without load, expect the voltage to further drop when loaded.
I think there's also such a thing as undervoltage shutdown or lock-out in power amps if the input voltage falls below a certain value. This is entirely theory for me though as I have not experienced severe undervoltage conditions where I live. I heard that feeding motors with lower than required voltage can cause them to run overly hot as increased current is forced to compensate for prolonged voltage sag.
I would think that any undervoltage in the amp's voltage rails will have the same effect as reducing the speaker load impedance. And that is to extract more current that could cause the protection circuit to engage when it could no longer produce the needed current to amplify the signal.
But since you are using Automated Voltage Regulators, they are supposed to output the correct 100v or 110v, as the case may be. The input household voltage sag must be so severe to cause more than 10% reduction in the AVR output . See if you can up their output voltage to the proper level or borrow another that does, and if your problem recurs despite this, then it's time to turn to a repair center.
I think your amp can not easily be destroyed by under voltage - the only thing you can do to validate if your amp is still in good condition is to try to plug it in the correct voltage and operate it and observe.
This is where I took off ...
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Pete's Law?
What is that?
;D ;D ;D :'( :'( :'(
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I think there's also such a thing as undervoltage shutdown or lock-out in power amps if the input voltage falls below a certain value. This is entirely theory for me though as I have not experienced severe undervoltage conditions where I live. I heard that feeding motors with lower than required voltage can cause them to run overly hot as increased current is forced to compensate for prolonged voltage sag.
ok, now i see, ;D guess i wasn't paying too much attetion on avphiles's post....
well, in all my years repairing amps and looking at schematics, i haven't seen any undervoltage protection in any amp that i know of, and the i understand the reason for that, there is no need for it whatsoever. i have explained in my previous post.
now motors are a different animal altogether, operating motors on undervoltage causes the rotor to move very slowly thus mimicking a short circuit. so here is where you get the idea! ;D this have no correlation with amps....
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Pete's Law?
What is that?
;D ;D ;D :'( :'( :'(
LOL! ;D ;D ;D :'( :'( :'(
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The undervoltage condition rarely does happen but it may happen. It is a good idea to have an undervoltage protection circuit both at the input and bulk (if budget permits and your market are 3rd world type).
Don't know if my Sansui amp has one.
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it happens all the time, and the net effect is decreased power available to the speakers...
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LOL! ;D ;D ;D :'( :'( :'(
guys,
you have to excuse me... I probably woke up this morning on the flipside. ;D ;D ;D :'( :'( :'(
seriously, lowering the input voltage will also lower the input current. this is in accordance with Ohm's Law (again), if V=IR, and R is the primary resistance of the tranny which is relatively constant, then to satisfy Ohm's Law, I should automatically lower itself with a lower V. this should also apply to Joule's Law for it also use V and I parameters, thereby having a lower power.
I understand rascal's concerns for protection during low voltage situations, but such events rarely damages power amps with conventional power supplies.
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btw, don't SMPS have this autovolt feature?
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guys,
you have to excuse me... I probably woke up this morning on the flipside. ;D ;D ;D :'( :'( :'(
seriously, lowering the input voltage will also lower the input current. this is in accordance with Ohm's Law (again), if V=IR, and R is the primary resistance of the tranny which is relatively constant, then to satisfy Ohm's Law, I should automatically lower itself with a lower V. this should also apply to Joule's Law for it also use V and I parameters, thereby having a lower power.
I understand rascal's concerns for protection during low voltage situations, but such events rarely damages power amps with conventional power supplies.
amen.... ;D
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btw, don't SMPS have this autovolt feature?
hey OT na tayo matagal na, but to answer you question yes, duty cycle is varied to cope with varying inout voltage..
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well, in all my years repairing amps and looking at schematics, i haven't seen any undervoltage protection in any amp that i know of, and the i understand the reason for that, there is no need for it whatsoever. i have explained in my previous post.
Ofcourse, I should have mentioned that undervoltage protection is fairly common in many Class D amps. I read their nature of operation requires one.
now motors are a different animal altogether, operating motors on undervoltage causes the rotor to move very slowly thus mimicking a short circuit. so here is where you get the idea! ;D this have no correlation with amps....
Another ofcourse. But if you read my statements in the proper context of that post, it was more an example to support my premise that undervoltage "can have detrimental effects on some appliances." And for the same reason, cited the existence of undervoltage protection circuits. But for most lnear amps, I agree, undervoltage will just result in underpower. But i think a severely voltage-starved amp, when you increase the volume, will just output current-starved square waves that are harmful to the speakers. IOW, it will attempt to extract the current needed to amplify the signal as you go up in volume. There being none, you get clipped signals. Now if such adverse output condition will triger the protection circuit, it should, but I have no experience in that.
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Thanks for the reply. You're lucky, konti lang meron nyan. That's an excellent amp unless you got a defective one. The other I mentioned, A-707, was the Saudi-type component amp once common here, yung mga binebenta sa international market nuon that accept speakers 8 to 16 ohms only. Ang alam ko marami dun nasunog na.
I was thinking the mains was your problem since undervoltage was common to your AVR and transformer. I'm using several AVRs and transformers now and measuring outputs on a monthly basis. Since I started buying Jap vintage hifi 5 years ago, I have limited my AVR and 100V transformer choices to two brands, Zebra and Panther, but there maybe better and cheaper brands now.
Sir Sandawa, thank you very much, I have seen many panther brands here in our place, maybe I will settle for that brand. Will a 500W will be ok for my amp?
You are right Sir, I have been using this amp for 3 years now and I really love this amp.
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hey OT na tayo matagal na, but to answer you question yes, duty cycle is varied to cope with varying inout voltage..
oo nga OT na.
sorry po... pero para sa kapakanan naman daw ng Sansui Amplifiers yun under-voltage discussion...
palusot pa ;D ;D ;D
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Sir Rascall, Sir Tony... baka maulit ung S2N-HAnz showdown.... wag naman sana... anyway, both of you are correct with respect to your analogies in electronics, la me mai-share but lots of informations I gained from you both.... THank you very much!!... God Bless!!!.. (OT)
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nawalan ako ng time sumilip dito ah!
recap ... I have yet to see amp destroyed by undervoltage ... speakers could be the one destroyed ;D ... no idea with class D yet ;D ;D
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Get a variac and for your 220Vac appliance set it to 180Vac and just leave it on.
Or, for your surplus amp set it to 70Vac. Same thing leave it on.
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I think the guy wants to increase the AC voltage, not decrease it. ???
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OT, AHobbit and TonyT said that they have yet to see an amp being destroyed by undervoltage. Best way to do it is have voltage at least 20% below low line eg
for 220Vac, low line = 198Vac for 100Vac, low line = 90Vac. This will show if there is undervoltage protection.
Going to the topic Sansui Amplifiers my AU-D907F gets very hot at 10 o clock volume position. Have checked biasing and measured around 25mV and 28mV at left and right channel, respectively. Is this normal?
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OT, AHobbit and TonyT said that they have yet to see an amp being destroyed by undervoltage. Best way to do it is have voltage at least 20% below low line eg
for 220Vac, low line = 198Vac for 100Vac, low line = 90Vac. This will show if there is undervoltage protection.
Going to the topic Sansui Amplifiers my AU-D907F gets very hot at 10 o clock volume position. Have checked biasing and measured around 25mV and 28mV at left and right channel, respectively. Is this normal?
where did you measured the 25mV and 28mV?
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At the output jack terminal of the amp (going to the speakers).
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At the output jack terminal of the amp (going to the speakers).
Ok, that is not the biasing. What you measured is your amp's DC Output Offset which by some standards can go as high as 100mV, but of course the lower the better.
Biasing is the amount of idle current flowing to the opt trannies, to get this you need to disconnect either the V+ or the V- and insert an ammeter or you can always measure the voltage drop accross any of the opt transistor's emitter resistor and use Ohm's Law to get the current.
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Ok. I used the wrong term.
What voltage bias do you apply to the base of the power transistors (sorry I typed gate earlier)? And, is the trim pot connected to it normally referenced to ground? Or is it a trimmer series type?
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Going to the topic Sansui Amplifiers my AU-D907F gets very hot at 10 o clock volume position. Have checked biasing and measured around 25mV and 28mV at left and right channel, respectively. Is this normal?
i have answred this type of question several times in at least two threads here.. ;D
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to understand clearly what jojo is saying we need to post the schematic of one of those sansui amps....any volunteer? ;D
plus you need to understand how the circuit works.... ;D
it is not a simple matter of asking what voltage is inputted to the base or gate... ;D
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Ok. I used the wrong term.
What voltage bias do you apply to the base of the power transistors (sorry I typed gate earlier)? And, is the trim pot connected to it normally referenced to ground? Or is it a trimmer series type?
Oh yeah, these terminologies can be a bummer sometimes.
Back to topic, it is not really a question of what or how much base voltage is needed but how much current is flowing during idle. Common topologies of class AB ss amps puts the idle current in the range of 25-40mA per device (Bipolar). This of course must be confirmed by an oscilloscope to see if the crossover distortion has been removed/minimized for the whole freq spectrum and from 1 watt to max opt power.
Biasing your opts higher will guarantee a minimized crossover distortion levels but at the expense of heat dissipation.
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Ok thanks. Will give it a go.
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Biasing your opts higher will guarantee a minimized crossover distortion levels but at the expense of heat dissipation.
Isn't that how they achieve class A-like operation on a push-pull class AB topology?
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Isn't that how they achieve class A-like operation on a push-pull class AB topology?
Yes it is. But with the anticipated heat dissipation. so more sinks, heftier tranny, sometimes more opt trannies, etc..
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So I wouldn't be surprised if the previous owner of the Sansui in question increased the bias for each output transistor. I do recall a colleague from ages ago saying that increasing the idle current up to a certain level without unduly increasing heat beyond what the sinks can handle actually yielded smoother and fuller-bodied sonics. I suppose that would be true if the amp didn't have a good class A/B design to begin with.
Would like to hear your comment on this
http://www.websitetoolbox.com/tool/post/sansui1944/vpost?id=1219919
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So I wouldn't be surprised if the previous owner of the Sansui in question increased the bias for each output transistor. I do recall a colleague from ages ago saying that increasing the idle current up to a certain level without unduly increasing heat beyond what the sinks can handle actually yielded smoother and fuller-bodied sonics. I suppose that would be true if the amp didn't have a good class A/B design to begin with.
Would like to hear your comment on this
http://www.websitetoolbox.com/tool/post/sansui1944/vpost?id=1219919
It's true, incresing the idle current would yield better sonics especially if the amp is used in a fairly low level volume, rendering the sound reproduction in pure classA operation. Only when the volume is turned up when it will shift to classB.
I read the link you posted, and the guy's better off increasing the idle current since he said his amp has a huge heatsink and can dissipate the heat.
However, his question of why didn't the manufacturer set it at this position, and instead they set it at a lower current of 36mA per device is simple to asnwer, the manufacturer took into consideration the SOA and secondary breakdown parameters of the opt devices. Raising the opt's idle current also raises it's temp, which in turn derates the device, hence it's available power capability will also be reduced, the opt devices will blow up before the amp can reach peak/full power as advertised. He mentioned C3284/A1303 devices so it's no surprise that the manufacturer had to compromise.
As we all know MOSfets donot suffer from secondary breakdowns and as of the moment, there is only one bipolar transistor that is immune from secondary breakdown and its the Sanken 2SC2922/2SA1216 Silicon Epitaxial Transistors. These Sanken devices are the workhorse of some of the more expensive amps we see now.
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Thanks for the confirmation of what I suspected. ;D
I would imagine circuit designers in these brands will design their circuits around a given transistor or IC operating traits and optimize their use for the price objective they have to work within. And these are often made with a lot compromises here and there. A well informed or seasned DIYer would know how to lift those compromises and so come out with a modified rig that can be superior in many ways to the commercial orig. ;D
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Indeed. In fact, our very own Tony here buys every suitable heatsink he can find. ;D With this in mind, he can design the amp with extra C/W parameters so it can be pushed with a little bit higher idle current and still be able to provide extra power to the load while operating the opt devices within it's SOA.
I bet Tony's heatsink collection is a sight for sore eyes. 8)
Cheers
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I suggest he look into those water coolant systems used in super-moded Pentium PCs and how they can be applied to power amps. If I recall right, there was an expensive power amp using some sophisticated active cooling system other than typical convection. ;D
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I suggest he look into those water coolant systems used in super-moded Pentium PCs and how they can be applied to power amps. If I recall right, there was an expensive power amp using some sophisticated active cooling system other than typical convection. ;D
I see these during the haydays of cpu overclocking. 8)
This could be the answer for those massive ss ClassA power amps, a cool amp to listen to while eating boiled eggs. :o ;D
Seriously, I have yet to see an inspiration for such a project. Copper or aluminum billets are available which can be machined to provide water holes and the water flow can then be moved by an aquarium pump. Those mini radiators from scooters or those aircon evaporators can also serve as heat radiators. Wow! ;D ;D ;D
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Yeah, come to think of it, a 3/4 HP aircon is actually no larger or heavier than a Bryston or Perraux power amp. So if you can replace those bullet-proof heatsinks with a compressor motor and heat exchanger for even a 1/2 HP, you can have all the audio freon-cooled muscle while cooling some beer cans beside. :o ;D Rather than boiling your eggs on those massive heatsinks. ;D
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Yeah, come to think of it, a 3/4 HP aircon is actually no larger or heavier than a Bryston or Perraux power amp. So if you can replace those bullet-proof heatsinks with a compressor motor and heat exchanger for even a 1/2 HP, you can have all the audio freon-cooled muscle while cooling some beer cans beside. :o ;D Rather than boiling your eggs on those massive heatsinks. ;D
looking at the innards of the sansui 907, i'd say it has a freon copper tube with fin fan coolers, amps dating back to the 80's indeed have used this method, i can not now recall what model/s or makes those were...
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jojo,
i just got to hand it to you man, ;D you not only can make fine amps, but posts theories that are beyond arguing. keep it up.... ;D
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mga sansui gurus.. comment naman sa sansui au70.. oks ba tong vintage amp na to? thanks
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I own an AU-70, which was made in 1965 before Sansui produced its classic AU-111 (also valve-based) and before it eventually shifted to solid state amps. The AU-70 is okay for me at low volume -- room level. With 25wpc output, it's not comparable with clean-sounding solid state amps I have. It has not been hooked in a system since 6 months ago for the simple reason I'm not a big tube fan: I have a dozen SS amp-driven systems all over my apartment unit, which to my ears any one sounds better than a system using AU-70. I had Radford and Scott 20 years ago but I prefer good dynamics, clean loud sound, which my tube amps, including the AU-70, couldn't deliver.
But if a good condition AU-70 is sold at P5K, maximum, I'll probaly buy it.
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Hi,mr.sandawa could you please comment sa sansui solid state receiver model 800 pamana sakin ng erpat ko imagine almost 40 years na gumagana parin paired w/ philips loudspeaker ganda parin tibay kaya partly i disagree na tawagin sansunog coz up to now di nag babago tunog and last thing i also have a 9090DB ang lakas at napakabigat magkano na value compare sa dalawang receiver maraming salamat ,ael
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Sorry, I can only comment on gear I am familiar with. I haven't owned a Model 800 but I had a 9090DB (made in 1974 and rated at 125wpc) 25 years ago and it was really a good one. BTW, 9090DB is still selling at a good price in the US, a little less than $300, which is in the same price range as used Dynaco ST-70.
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jojo,
i just got to hand it to you man, ;D you not only can make fine amps, but posts theories that are beyond arguing. keep it up.... ;D
tony,
thanks man ;D, it trully pays to learn from the best... ;D
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Sandawa,
Sir, may I suggest that you at least run those vintage tube amps once a month to keep the electrolytic caps in good condition. otherwise, if the amp has been shelved for more than 3 months then it may be wise to reform the caps first before operating the unit.
hope it helps...
AEL,
The term "sansunog" was coined when Sansui "radicalized" their design from the more conventional feedback design to their (as they say) "revolutionaly" concept of feedforward.
Most of the amps built before this transistion are made like battle tanks, strong enough to survive a world war. unfortunately, the newer amps have such weakness that a mere oscillation can blow up all the output trannies... hence the term, "sansunog".
Cheers
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If I recall right, the very first Sansui models using their proprietary super feedforwrd circuits were stable enough and had the unparalled reputation for being the most accurate and neutral of SS amps at that time. I think the models were the AU-D9 and 11 models. With a power bandwidth and frequency response from DC to 300khz, with a deviation of no more that 0.01db at a THD of 0.005%, they were said to be one of the finest SS amps ever produced on earth, not only at that time, but pressumably for ALL time. (In contrast, the current Bryston SST line consdied the finest modern power amp has a freq response startng at 0.5hz to 100khz at 0.007% THD)
It was the succeeding models with "enhanced" super feedforward designs that got into oscillation problems that fried their transistors at the slightest excuse. But still, WHEN they worked, you got the best SS sound possible. And when they didn't work, they were often in the repair shops. ;D And promptly got the name "sansunog."
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To sandawa and jojo both of you thanx for the info. now i can say today that i am proud and happy to have this sansui receiver aalagaan ko lalo itong 9090db at 800 salamat uli,ael
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I maybe wrong but if I remember correctly, the "Sansunog" term here was coined due to high rate of failure among Sansui amps and receivers that were common at the height of "Saudi days." The early OFWs brought home a lot of Sansui amps and receivers -- models starting with "A" for amps (not AU) and "R" (instead of "G" or "Z") for receivers. Those gear were made as part of component systems and accepted only 8 to 16 ohm speakers (better if used with the prescribed Sansui floorstanding compo units). I myself experienced one such failure, a few weeks after I hooked an AR speaker rated 8 ohms to an A-707 amp. The Audiolab Timog technicians told me later that AR speaker had an effective 6-ohm impedance. Some Sansui/Sansunog owners used Infinity, very popular during those days, rated 4 ohms resulting in breakdowns.
Take note that models A for amps and R for receivers hardly appear in existing Sansui directories, especially those released in Japan. This only shows the Japs sold inferior and cheap Sansui in the international market during those years to corner a good share of the newbie market, especially those who tend to favor "looks" over "sound." The hifi oldtimers here who saw those early component packages would attest how good-looking those systems were.
On the "feedforward technology", I'm not a technician but I've read somewhere it also involves high bias and thus Sansui hardly used class A description in its upscale amps even as most of their good amps run hot. There's only one major documented complaint on oscillation specifically model AU-X1 involving a unit acquired by BeatleFred the former moderator of Sansui forum in Audio Karma and his case spread like wildfire on the Internet. The feedforward technology was generally blamed for it -- the unstable bias or biased to the edge, whatever -- but BeatleFred admitted in his later post in AK and Classic Sansui forums that the unit he complained about seemed to be already defective when sold to him. After some research, the seller of that problematic AU-X1, he concluded, had cases of disposing altered/modified units not only of Sansui's but Accuphase's as well. Take note that Beatle Fred has two AU-X1 units and that he never had a problem with the older one.
BTW, I have an AU-X11, which is almost the same as AU-X1 (except for my unit's wood side panels and a different heat-sink layout.) A friend here in Davao also owns an AU-X11. That model does run hot, like class A, but we never had a problem with it.
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Yung sansui A-5 ko pala "sansunog"? hehehehe bigay nga sakin ng uncle ko ito, saudi boy yun nung araw. kaya rin pala nahihirapan ako hanapin yung sa net ang specs nya.
pero ok naman hindi pa naman nasusunog, mas maganda pa tumunog kesa sa receiver ko in stereo setup. nakakabit ito ngaun sa infinity primus line speaker.
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Gentlemen,
Let's not forget that oscillation problems in a power amp can also be caused by conditions other than it's design topology. When conditions are right for an oscillation to occur, then all hell break's loose.
Sansui Power amps has been a part of the colorful history of home hi-fi, let us not concentrate and burden ourselves with such problems. If your particular model is working fine then you should consider yourself lucky that you have experienced a better part of audio history and most of all - enjoy your Sansui Amplifiers. ;D
Cheers
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re: feedforward technology
this was brought about by the fact the at high frequencies, there is a delay in the negative feedback circuit , error voltage from the output ciruit arrives a bit late to the input stage negating its usefulnes, and so to address this issue, feedback from the output is cutoff at high frequencies and instead taken from and earlier stage other than the output, say VAS of first predriver stage, where the transistors used are faster than those of the ouput stage.
prof. leach adopted this in his 4.5 version of the leach low-tim amp and likewise the latest iteration of his super leach amps all because accroding to him it made sense... ;D
re: SANSUNOG,
saudi amps when used sensibly can last a long time, the problem is with the users who do not know any better and went on abusing the poor amps! since many replacement parts available in raon were of dubious quality and more often fakes, repairs can sometimes become a nightmare. that is why the term sansunog.
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check this out :o this is as mint as it can get
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320037783300 (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320037783300)
and the mother of them all...AK guys drooled at this one
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150024175595 (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150024175595)
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Hi Sir, I have the same problem with my amp a Sansui AU Alpha 707, from what I know, this is a result of the circuit protection unit activating because it senses something wrong in the amp to avert further damage.
"Mga masters" can you help us on the most probable cause of this problem, my amp stops after I played a few songs.
Thanks.
Hello Sirs: Sandawa, Av_phile, Tony and all,
Finally I had my Sansui repaired, I returned it to the pier and told them that I got the amp from them 3 years ago, after 2 days the amp was repaired. According to the technician he just replaced a malfunctioning transistor at the pre-amp section. I paid 350 pesos for the repair, I think I was charged too much for a small transistors but I was happy with my amp working again.
Thank you all for the advises.
Below you can see the happy amp:
(http://i167.photobucket.com/albums/u141/jojo0416/SA%208800%20II/pic_146a.jpg) :)
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pwede na ibenta yan, then get yourself an onkyo or a pioneer para maiba naman ang experience... ;D
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Sir Tony,
Thanks. Actually I sold my Onkyo Integra to a colleague (who is also one happy owner of that amp till today) to get this amp because I do not have enough funds at that time but should I come across again with an Integra (817 RX) of the same condition of my previous amp I will surely buy it....as it was my first amp then and actually that is how the surplus amp thread of akyatbundok started.
OT, Sometimes we joke that because of him its difficult now for us to look for gems at the pier but on the otherhand we know for a fact that he helped a lot of people by him starting the thread especially for people like me at that time was starting the hobby.
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you can also try those shops in cubao along aurora blvd. near isetan... ;D
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OT:
Sir TONY...paistorbo, sent u a pm...tnx
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OT: pm answered. ;D
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OT: ;D...thanks sir Tony....sent u pm
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was looking for a Sansui tuner, tape deck thread to post this picture but i guess this is close enough. may kasama naman amp yung units ko. ;D
posting my "growing" Sansui family. akala ko tigil na sa amp, but when i saw sir bong's FS tuner and tape deck combo... uy, bagay ah. ala, sige na nga. ;D
from top:
Sansui SC-2110 tape deck
Sansui TU-717 tuner
http://www.audio-heritage.jp/SANSUI/tuner/tu-707.html
Sansui BA-2000 power amp
http://www.audio-heritage.jp/SANSUI/amp/ba-2000.html
(http://img529.imageshack.us/img529/4292/sansuifamilykj7.th.jpg) (http://img529.imageshack.us/my.php?image=sansuifamilykj7.jpg)
other Sansui family members
Sansui AU-111
http://www.audio-heritage.jp/SANSUI/amp/au-111.html
(http://img529.imageshack.us/img529/5186/au11101ao3.th.jpg) (http://img529.imageshack.us/my.php?image=au11101ao3.jpg)
Sansui TU-555
http://www.audio-heritage.jp/SANSUI/tuner/tu-555.html
(http://img529.imageshack.us/img529/1830/tu01kw6.th.jpg) (http://img529.imageshack.us/my.php?image=tu01kw6.jpg)
beautiful master pieces all ;)
this has got to stop right now >:(... hmmm teka, if only an AU-717 (707) would surface ;D ;D ;D
thanks for passing by :)
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Astig!!!
Great acquisitions Sir Southpeak.
Inggit ako sa tuner. I have bottom of the line Sansui tuner only. :) haha. The Sansui Tu207 is now doing service in a daughter's room along with a Sansui au7500.
(http://i29.photobucket.com/albums/c289/Lordfoo/Sansui_tuner_TU207_b.jpg)
I've been able to get hold of an old Sansui Turntable, a Sansui SR2050c.
Not top of the line gear like yours but i was quite attracted by its vintage appearance.
I thought it would go well with my Sansui integrated amps.
I have to do some work pa on the automatic mechanisms.
(http://i29.photobucket.com/albums/c289/Lordfoo/sansuisr2050c_2.jpg)
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Astig!!!
Great acquisitions Sir Southpeak.
Inggit ako sa tuner. I have bottom of the line Sansui tuner only. :) haha. The Sansui Tu207 is now doing service in a daughter's room along with a Sansui au7500.
I've been able to get hold of an old Sansui Turntable, a Sansui SR2050c.
Not top of the line gear like yours but i was quite attracted by its vintage appearance.
I thought it would go well with my Sansui integrated amps.
I have to do some work pa on the automatic mechanisms.
thank you sir foo. :)
i'm sure its not the bottom or the top we enthusiast are looking (hearing) at. i'm very sure its the enjoyment and pleasure these vintage stuff are giving us. :D
hindi nyo pa nga pinapakita yung floor to ceiling nyong collection at iba pa :o . wait till you see those mga kakosa.. 300 ang dating ;) ;D
btw, i read you are located somewhere near camp crame and camp aguinaldo? although i'm now based in san pedro, laguna, we stilll have a house in bgy west crame papasok, due my late father being a former PC (Philippine Constabulary aka PNP). malamang meron din sana tayong session sa area natin..
cheers :)
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Great acquisition, Sir Southpeak!
Lord foo,pajoin sa session ha ;D, im just nearby too...proj 2.
Thanks!
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Great acquisition, Sir Southpeak!
Lord foo,pajoin sa session ha ;D, im just nearby too...proj 2.
Thanks!
thank you sir dana. kayo rin sabi ni sir bong, halos madapa daw sya nung makita nya yung mga collection nyo ;D. sana mag karoon din ako ng panahon na ma bisita kayo. one of these days sir.. :)
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sirs, feedback naman regarding sansui au-719. may binebenta po kasi sakin 4.5k. maganda po ba review nito at tama po ba presyo nya? tnx!
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sansui AU alpha 607 MOS LIMITED
;D
nice intégrated and nice sound
(http://fotoforum.fr/photos/3/u8ejn5be.jpg) (http://fotoforum.fr)
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mga sansui owners baka may mga amplifier kayo na "defective" aka hopeless situation. benta nalang ninyo sa akin. text your sansui model no and price. thanks
09179888768
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I have a defective Sansui Stereo Amplifier AU-7700. Can somebody please direct me where to bring this for repair? Thanks :)
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CONGRATS !
nasa guhit yata ng b*ls este ng palad ang swerte mo sir! ;D
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I hardly noticed AU-XII's heft in sound, compared with alpha 907 for instance, until I used it with a tube preamp with gains early last month. My AU-XII is now paired with Luxman SQ-38FD Mk II, which I was able to revive, in driving a pair of JBL 4430. The SQ-38 only had 30wpc (valve) power amp, which is too thin for my ears. When I paired it with the AU-XII, harnessed as power amp, the sound that came out of the 4430 was something else. SQ-38 has treble and bass gains plus turnover switches for low and high frequencies.
Congratulations! $180 is cheap for the AU-XII, I actually got mine at slightly lower price about 6 years ago. Me and Diego/EGP, here in Davao, have one unit each of AU-XII. Now we're three. I think there's also a guy in Laguna who once emailed me claiming he has this amp, but he's not a member of Pinoy DVD if I'm not mistaken.
A couple of years back, the guys in AK could hardly believe I have an AU-XII and that my unit has no oscillation problem. Some probably even thought I was the perennial scammer on US eBay trying to sell a ghost unit of AU-XII for a grand. I told them I'll never sell my unit (quite heavy and messy to peddle at US eBay) and that it is a common amp here in the Philippines.
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You're wise to post your unit's serial number, which I failed to do even in AK threads. At least doubters would know our units are authentic. I'm posting mine's SN too below. BTW, if your sidings are narra, that could be custom-built, they look beautiful, a lot better than the original veneer with MDF inside:
(http://i7.photobucket.com/albums/y275/nanideleon/100_3327.jpg)
Notice the veneer siding
(http://i7.photobucket.com/albums/y275/nanideleon/100_3270.jpg)
The third digit in Sansui serial number is usually the year of production in the model series -- AU-XII was produced from 1981 to 1983
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@oweidah>hahahaha, sana sir type nyo nalang cojones, susyal basahin ;D.. thank you po
kinakalawang na ang espanggol eh ;D
sansui sound really brings back a blast from the past. im fortunate with a recently acquired au9500. sana makahanap kapakner na tuner tu9500
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Guys san pwede paayos ng amp. Meron kasi ako nahukay sa baul na sansui stereo reciever 441. To my surprise working pa yun unit kaya lang may kalawang na yun mga terminals and yun cover. It seems may problema yun balance knob since hindi smooth yun pagbalance nya pag-turn mo ng knob. Yun bass knob naman parang no effect. Pwede ba pa refurbish to make it look and perform like new?
I also have this technic m6 tape deck and surprisingly working pa din sya kaya lang di ko pa natetest kung makakapagproduce ng sound since wala na akong tapes and a technic turntable na di ko alam kung gumagana since i dont see any power button to switch on. Saan kaya pwedeng paggawa ito? or maybe swap ko nalang yun TT saka tape deck if ever working pa...
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I have a defective Sansui Stereo Amplifier AU-7700. Can somebody please direct me where to bring this for repair? Thanks :)
I don't know if the following is still existing:
AUTHORIZED SANSUI SERVICE CENTER - PHILIPPINES
FIL-AUDIO
UNIT-1086 to 1092 VV Soliven Bldg.
EDSA San Juan
Tel. No. 7262697 (Danny)
I had a Sansui AU-717 and TU-717 repaired there before.
Good luck.
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uy swerte pala ni itay! may nabili sya sa pier worth 15k. sansui xII din. hehehe maligawan nga.. hahaha ;D
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Came across a Sansui AU-D-606, any idea mga sir kung ano yung output nya at ok po ba ang model na to?
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Haven"t heard that model brader, I recently had a sansui au d907g extra..boy this amp rocks. You need not spend a fortune to have an amp this good. Ganda, sound very clean, bass is adequate and never boomy. High end sound. I"m very happy with my purchase. Now I need to look for a 160wpc sansui. :)
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Came across a Sansui AU-D-606, any idea mga sir kung ano yung output nya at ok po ba ang model na to?
Baka you mean AU-D607? >>> http://audio-database.com/SANSUI/amp/au-d607-e.html (http://audio-database.com/SANSUI/amp/au-d607-e.html)
If yes, equivalent nyan outside Japan is AU-519 >>> http://classichifi.info/SansuiAU-519.htm (http://classichifi.info/SansuiAU-519.htm)
I had the chance to own yung predecessor nyan which is the AU-607. Maganda yan, sir. Part ng 2nd generation models ng AU series. Outputs 70 wpc. Dalawa transformer sa loob, maganda build quality. And to prove that, mataas pa rin resale value nya. Average ng 89,800JPY (around 40,000PHP) base dun sa last 2 units sold sa hifido -
http://www.hifido.co.jp/KWsansui+au-d607/G0101/E/0-10/C12-66669-43288-00/ (http://www.hifido.co.jp/KWsansui+au-d607/G0101/E/0-10/C12-66669-43288-00/)
http://www.hifido.co.jp/KWsansui+au-d607/G0101/E/10-10/C12-65647-43137-00/ (http://www.hifido.co.jp/KWsansui+au-d607/G0101/E/10-10/C12-65647-43137-00/)
If the price is right, bilhin mo na :) Lahat kasi ng AU-D6xxxxx models after nyan, with the exception ng mga Alpha, hindi na kagandahan.
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Tama si sir parasmi. Maganda nga yang AU-D607. Sansui au-519 ata international model nya.
try mo to from AK. http://www.audiokarma.org/forums/showthread.php?t=285619
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Any comments on the Sansui AU-7900?
I have a cousin who can get me one...although it's in California. Practically NOS condition. Still has the box and is still wrapped in its packaging plastic. Tested to be working perfectly (daw).
nbc
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Receiver ata yan sir judging by the model number. Sansui receivers sound great too. :)
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Receiver ata yan sir judging by the model number. Sansui receivers sound great too. :)
Integrated Amp daw. Truthfully, I don't know my Sansui's well enough. Although, when i was a kid, my dad had several and it was his favorite amps to play among his collections.
nbc
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Receiver ata yan sir judging by the model number. Sansui receivers sound great too. :)
Its an integrated amp.
https://www.google.com.ph/search?q=sansui+AU-7900&hl=en&client=firefox-a&hs=uei&sa=X&tbo=u&rls=org.mozilla:en-US:official&channel=rcs&tbm=isch&source=univ&ei=ODvwUOSQNszRkwWM_oGYDA&ved=0CCkQsAQ&biw=907&bih=491
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Any comments on the Sansui AU-7900?
I have a cousin who can get me one...although it's in California. Practically NOS condition. Still has the box and is still wrapped in its packaging plastic. Tested to be working perfectly (daw).
nbc
That is a nice integrated. I have read a review that compared this unit with other units at the time and it rated higher or equal to TOTL units such as the pioneer sa-9900 etc.. It was rated best buy on that review.
I have the lower model and you would be surprised with how full and big they sound. They may have lower rms ratings but they sound big.
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Hi guys need your advice, which would you prefer au-d-607 or au 707?
thanks
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^
Kung hindi malayo price difference go for the AU-707
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Mga Guru ano ba mas maganda? AU 607 or AU D607F ? TIA !
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^
not a guru hear but the former would be your best choice :)
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Very happy... for the past 3 weeks, i have been bidding on ebay for a nice Sansui amp.
Then, I thought, why not look for the amp that my dad used to have. I asked my elder brothers what model it was and we found some pics and we saw that it was a Sansui 5000A.
Well, today, I bought a Sansui 5000 in very mint and clean condition from Rene Rivo. It sounded like how I remembered it to sound... big and full and very, very tube like. :)
One happy puppy, that's me. Now, everytime i play it, I will remember my Dad. :)
nbc
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Very happy... for the past 3 weeks, i have been bidding on ebay for a nice Sansui amp.
Then, I thought, why not look for the amp that my dad used to have. I asked my elder brothers what model it was and we found some pics and we saw that it was a Sansui 5000A.
Well, today, I bought a Sansui 5000 in very mint and clean condition from Rene Rivo. It sounded like how I remembered it to sound... big and full and very, very tube like. :)
One happy puppy, that's me. Now, everytime i play it, I will remember my Dad. :)
nbc
congrats.....for sure that sansui makes you smile
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Here it is... :)
nbc
(http://img.photobucket.com/albums/v204/nbc/Sansui5000_zps284e248a.jpg)
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R u intereested to sale sansui au 111 , if yes pl. quote your price , this chato my cell no 09178548481 , makati city
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Can any body want to sale sansui au 111 tube amp pl. text or call me . this chato 09178548481
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Mga sir I'm currently eying this amp. Sansui BA-150. To be used for casual listening lang sa bedroom. Ok po ba yun model na to?
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Mga sir I'm currently eying this amp. Sansui BA-150. To be used for casual listening lang sa bedroom. Ok po ba yun model na to?
Maayos yan. Malakas tumulak despite its size.
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Happy Easter PDVD peeps!
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Mga sirs, ano ang masasabi nyo sa Sansui A9 at saka x501 ? Some neighbors have these and maybe they would sell if offered. Good ba mga ito?
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Haven"t heard that model brader, I recently had a sansui au d907g extra..boy this amp rocks. You need not spend a fortune to have an amp this good. Ganda, sound very clean, bass is adequate and never boomy. High end sound. I"m very happy with my purchase. Now I need to look for a 160wpc sansui. :)
Sir tormentor, how much will you sell your Sansui AU D907G extra? Baka sakali lang, although I feel you will cling to it till many years pa.
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i would buy a 100V Jap amp at twice the price of the same model with 220V power supply. the AU series, especially Jap domestic models, have significantly superior parts than their international versions. bottom line: quality of surplus Jap amps is higher compared with those they sold to the international market.
some of the original technicians trained by Sansui Japan in the '80s (formerly with the Sansui service center in VV Soliven) were still around the last time i had one of my gear repaired, which was 10 years ago. i remember i saw one at a Virra Mall repair shop, and several were working in electronic service shops near the corner of Del Monte and Banawe. i just don't know if they're still there.
Sir Sandawa, why so you would say you would buy a japanese 100V amp twice the price of the same model with 220V power supply on the AU series, especially jap models? Mine is a jap domestic model, same as you described, and lately, I am amazed at how some interested buyers in my place would offer to buy mine at a higher price which is way, way beyond my expectation. For that reason alone, more so on the musicality it brings to my ears, and the way it brought life to my old speakers, I decided not to sell it yet in the immediate future. Please elaborate Sir, I see in this forum that you are the guru for these Sansui amplifiers, thanks
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@gienr...
It means that Sansui's japanese AU series model are most used higher grade components/parts rather than international version/model...
I have (before) AU-D907F & AU-D11 now, these were the same circuit amplifier but different origin... I choosed D11 for great listening.
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@gienr...
It means that Sansui's japanese AU series model are most used higher grade components/parts rather than international version/model...
I have (before) AU-D907F & AU-D11 now, these were the same circuit amplifier but different origin... I choosed D11 for great listening.
Sir Vhinx, for your AU D907F, what speakers did you use that pleases you the most? I am using vintage speakers for my 907 but it seems lacking, parang may gustu pa akong hanapin na musicality and I think a good pair of speakers na hindi ko pa nadidiskubre ang dapat.
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Nice !!!
Very happy... for the past 3 weeks, i have been bidding on ebay for a nice Sansui amp.
Then, I thought, why not look for the amp that my dad used to have. I asked my elder brothers what model it was and we found some pics and we saw that it was a Sansui 5000A.
Well, today, I bought a Sansui 5000 in very mint and clean condition from Rene Rivo. It sounded like how I remembered it to sound... big and full and very, very tube like. :)
One happy puppy, that's me. Now, everytime i play it, I will remember my Dad. :)
nbc
Here it is... :)
nbc
(http://img.photobucket.com/albums/v204/nbc/Sansui5000_zps284e248a.jpg)
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Sir Vhinx, for your AU D907F, what speakers did you use that pleases you the most? I am using vintage speakers for my 907 but it seems lacking, parang may gustu pa akong hanapin na musicality and I think a good pair of speakers na hindi ko pa nadidiskubre ang dapat.
Sir, I used Paradigm Phantom V1 for main front and FS Polk RTL for fast/louder soundstage... now, i'm trying to set up Infinity and Yamaha vintage speaker to my Sansui's series amps pero pag hindi din nag match e malamang dispatsa ko na.
What you mean lucking sir at ano po gamit mo speaker sa 907?... :)
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Sir Vhinx, for your AU D907F, what speakers did you use that pleases you the most? I am using vintage speakers for my 907 but it seems lacking, parang may gustu pa akong hanapin na musicality and I think a good pair of speakers na hindi ko pa nadidiskubre ang dapat.
Sansui and vintage JBLs. Ok yun:)
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Sir, I used Paradigm Phantom V1 for main front and FS Polk RTL for fast/louder soundstage... now, i'm trying to set up Infinity and Yamaha vintage speaker to my Sansui's series amps pero pag hindi din nag match e malamang dispatsa ko na.
What you mean lucking sir at ano po gamit mo speaker sa 907?... :)
Ang gamit ko sir vhinx ay vintage pioneer 10" dia ang driver at 5" ang mid then with twitter, a 3way speaker sir. Parang what I need is a 15" dia driver that will give me a complete bass effect.
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Ang gamit ko sir vhinx ay vintage pioneer 10" dia ang driver at 5" ang mid then with twitter, a 3way speaker sir. Parang what I need is a 15" dia driver that will give me a complete bass effect.
I think is not the way bro, i also used Pioneer S-18xx 12" speaker before but it feels lock of bass too... I recommend used your existing speaker and add 10" to 12" active subwoofer for better bass response.
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Mga sir I'm currently eying this amp. Sansui BA-150. To be used for casual listening lang sa bedroom. Ok po ba yun model na to?
I've been happily using BA150 :)
its warm sounding characteristics is nicely paired with detailed sounding infinity
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Good day to all.
I was recently introduced to the Sansui sound and I have been hooked!
Just curious if you could lead me to other possible sources of Sansui gears.
Thanks!
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Here it is... :)
nbc
(http://img.photobucket.com/albums/v204/nbc/Sansui5000_zps284e248a.jpg)
Nice one parang yung nabili ko kay louie..
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Chanced upon a sansui 9090db yesterday on protection mode and I bought it cheap. upon inspecting madami pala nasunog na pyesa sa driver board assembly and meron din burned parts sa board underneath it dahil nabasa yung unit. baka may magandang loob na meron ganitong unit na sira and pwedeng bilihin yung driver board assembly lang. TIA!!!
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Buhayin ko lang. :)
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Buhayin ko lang. :)
Picturan na yan para masilayan ko naman hehehe.
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Hehe mamaya ka ernie. Set-up pa lang hehe
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Pagbutihin mo set up hehe :) :)
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Sabi ko na eh Kilala ang Sansui bilang SanSUNOG pero ok sya tumunog...
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Chanced upon a sansui 9090db yesterday on protection mode and I bought it cheap. upon inspecting madami pala nasunog na pyesa sa driver board assembly and meron din burned parts sa board underneath it dahil nabasa yung unit. baka may magandang loob na meron ganitong unit na sira and pwedeng bilihin yung driver board assembly lang. TIA!!!
I've read from here and other forums that the unit you've acquired sounds great so it would be worth restoring it. If in any case puwede mo ipasa sa akin brader at baka ako makabuhay niyan, hehe
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naibenta na yata...
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Sabi ko na eh Kilala ang Sansui bilang SanSUNOG pero ok sya tumunog...
Yung mga saudi models yun not the jap domestic ones.
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Yung mga saudi models yun not the jap domestic ones.
yes, intended for sale sa mga migrant workers at OFW's at a very cheap price....
i once read a catalog written in Filipino, very well written indeed, talagang mapapabile ka...;)
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Yung mga saudi models yun not the jap domestic ones.
Especially w/ A and R models.
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MY SANSUI AU-9500 IN ACTION!
(http://i1299.photobucket.com/albums/ag61/baletlet/IMG_20140729_171155_zps0f2563ed.jpg) (http://s1299.photobucket.com/user/baletlet/media/IMG_20140729_171155_zps0f2563ed.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/IMG_20140729_171052_zpsf1bbdfc4.jpg) (http://s1299.photobucket.com/user/baletlet/media/IMG_20140729_171052_zpsf1bbdfc4.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/IMG_20140729_171041_zps9c856306.jpg) (http://s1299.photobucket.com/user/baletlet/media/IMG_20140729_171041_zps9c856306.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/IMG_20140729_171032_zps64cd0edf.jpg) (http://s1299.photobucket.com/user/baletlet/media/IMG_20140729_171032_zps64cd0edf.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/IMG_20140729_171024_zps3b965cc5.jpg) (http://s1299.photobucket.com/user/baletlet/media/IMG_20140729_171024_zps3b965cc5.jpg.html)
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^_Ayun oh! congrats ka Ernie.... :) :) :)
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Ganda!
Boom "Banes"....to! He he
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Ganda!
Boom "Banes"....to! He he
Mana lang sa iyo sir ;)
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Mana lang sa iyo sir ;)
Kaya naman pala mana kana ke Forseti e.. Boom Panes !
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^_Ayun oh! congrats ka Ernie.... :) :) :)
Thanks bro. edmon..... :) :) :)
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Meron ba kayo list ng Sansui from best to worst? Para may reference mga may balak kumuha ng Sansui ;D
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Meron ba kayo list ng Sansui from best to worst? Para may reference mga may balak kumuha ng Sansui ;D
Based on my experience, the best one's to get are the "9" series. It indicates as the flagship range eg:
AU 9500
AU 999
AU 907/919
Alpha 907
G 9000
With the exception of: AU 111, AU 111 MOS VINTAGE, AU 1111 MOS VINTAGE....all of these are top of the line series.
Please correct me if I'm wrong, to other members.
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Based on my experience, the best one's to get are the "9" series. It indicates as the flagship range eg:
AU 9500
AU 999
AU 907/919
Alpha 907
G 9000
With the exception of: AU 111, AU 111 MOS VINTAGE, AU 1111 MOS VINTAGE....all of these are top of the line series.
Please correct me if I'm wrong, to other members.
Korekek :) :) :)
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907/919 vs alpha 907 anu po masabi nyo sa sounds nito thank you
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907/919 vs alpha 907 anu po masabi nyo sa sounds nito thank you
Pareho ako meron nyan.... 907/919 is less muscles than alpha 907.
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clear ang 919 sa sound very detail smooth talga ang highs pero manipis ang bass....naku dapat punta nako sta rosa meron dun kaya lng mahal he he
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clear ang 919 sa sound very detail smooth talga ang highs pero manipis ang bass....naku dapat punta nako sta rosa meron dun kaya lng mahal he he
Mas clear, detailed and smooth ang alpha 907 and well refined at matindi ang bass.. than 919.
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Iba ang alpha 907. Words are not enough to explain how good this amp is :)
clear ang 919 sa sound very detail smooth talga ang highs pero manipis ang bass....naku dapat punta nako sta rosa meron dun kaya lng mahal he he
Sulit ka dun sir. Upgrade proof. A friend of mine recently heard my alpha 907. Sabi niya after, it is time to look for an alpha 907. Bkain a matter of days nasa MP na high end set up nya hehe
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ok i will upgrade hanap hanap muna ng alpha 907
itong set up na sinasabi mo sir walang ibang naka attach 907 alpha speaker at cd player or tt lng
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Iba ang alpha 907. Words are not enough to explain how good this amp is :)
Sulit ka dun sir. Upgrade proof. A friend of mine recently heard my alpha 907. Sabi niya after, it is time to look for an alpha 907. Bkain a matter of days nasa MP na high end set up nya hehe
Hehehehe
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Ka Ernie saan ba pwede makakuha ng AU 907 na yan at magkano kaya mukhang nakaka-intriga ha....hehehehe
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Wanna share my sansui au 5900.
Found this one in a japan surplus here in cebu. Mukhang malinis at makinis pa naman for a 1975-77 model.
When we tried it with a diatone 40c speaker even with an iphone as source, ok naman tumunog so i bought it.
Not familiar with sansui models. any feedback on this model? btw, it's a japan model 100V.
here's the photo.
(http://i1274.photobucket.com/albums/y437/Nolax_Montemar/sansui_zpsa2dea76d.jpg) (http://s1274.photobucket.com/user/Nolax_Montemar/media/sansui_zpsa2dea76d.jpg.html)
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Wanna share my sansui au 5900.
Found this one in a japan surplus here in cebu. Mukhang malinis at makinis pa naman for a 1975-77 model.
When we tried it with a diatone 40c speaker even with an iphone as source, ok naman tumunog so i bought it.
Not familiar with sansui models. any feedback on this model? btw, it's a japan model 100V.
here's the photo.
(http://i1274.photobucket.com/albums/y437/Nolax_Montemar/sansui_zpsa2dea76d.jpg) (http://s1274.photobucket.com/user/Nolax_Montemar/media/sansui_zpsa2dea76d.jpg.html)
Congratulations!
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Congratulations!
thanks for the help yesterday bro. Nadisturbo ko flight mu hehe. excited lang. :)
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thanks for the help yesterday bro. Nadisturbo ko flight mu hehe. excited lang. :)
Sus, no problem...meron pa bang ibang goodies dyan? PM/text me hehehe
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Wanna share my sansui au 5900.
Found this one in a japan surplus here in cebu. Mukhang malinis at makinis pa naman for a 1975-77 model.
When we tried it with a diatone 40c speaker even with an iphone as source, ok naman tumunog so i bought it.
Not familiar with sansui models. any feedback on this model? btw, it's a japan model 100V.
here's the photo.
(http://i1274.photobucket.com/albums/y437/Nolax_Montemar/sansui_zpsa2dea76d.jpg) (http://s1274.photobucket.com/user/Nolax_Montemar/media/sansui_zpsa2dea76d.jpg.html)
Nice catch! I used to have that model before. I'm using that before driving my Dynaudio Audience 70.
Try using the amp to other speakers and you'll be amaze how it performs.
Congratulations!
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Wanna share my sansui au 5900.
Found this one in a japan surplus here in cebu. Mukhang malinis at makinis pa naman for a 1975-77 model.
When we tried it with a diatone 40c speaker even with an iphone as source, ok naman tumunog so i bought it.
Not familiar with sansui models. any feedback on this model? btw, it's a japan model 100V.
here's the photo.
(http://i1274.photobucket.com/albums/y437/Nolax_Montemar/sansui_zpsa2dea76d.jpg) (http://s1274.photobucket.com/user/Nolax_Montemar/media/sansui_zpsa2dea76d.jpg.html)
Nice catch sir...try it w/ your b&w685. Try to look for sansui hi end vintage amps, palagay ko maiibigan nyo.
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bai, bag.o lang ko dri, pasensya na, asa mana pier inyo gi hisgutan? nangita ko power amp. salamat
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hi. gusto ko lang po magtanong kung saan yung repair centre ng sansui dito sa metro manila? ipapa check ko lang po itong alpha au-507i ko. ok pa rin po ba yung mga shop sa kanto ng del monte at banawe? salamat!
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pm mo si sansui-dan aka jun medina....
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sir cannot be found na po yung sansui-dan
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pm mo ko, bigay ko number nya...
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sir cannot be found na po yung sansui-dan
http://www.pinoydvd.com/index.php/topic,159532.msg1612467.html#msg1612467
try mo to
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pm mo si sansui-dan aka jun medina....
Is he accommodating?
Had a bad experience from this guy, he believes so much of him.
Just sharing the experience during my inquiry for assistance to repair some of my Sansui units.
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I highly recommend markcrenz PinoyDVD Legend. http://www.pinoydvd.com/index.php?action=profile;u=21515
He has not destroyed any of the gears I have brought to him for maintenance and repair unlike some others.... Importantly as a fellow music lover, he understands our concerns.
hi. gusto ko lang po magtanong kung saan yung repair centre ng sansui dito sa metro manila? ipapa check ko lang po itong alpha au-507i ko. ok pa rin po ba yung mga shop sa kanto ng del monte at banawe? salamat!
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Is he accommodating?
Had a bad experience from this guy, he believes so much of him.
Just sharing the experience during my inquiry for assistance to repair some of my Sansui units.
I have heard some bad stories also... though not my personal experience.
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Is he accommodating?
Had a bad experience from this guy, he believes so much of him.
Just sharing the experience during my inquiry for assistance to repair some of my Sansui units.
Jun Medina is a Japanese trained tech used to work at Sansui Service Center
at VV Soliven towers before, so he is qualified....he tells me he is swamped with work....
the problem very common with vintage gears is parts availability as many of the semicons
have become obsolete due to age...simply not available anymore....
So if he thinks that your unit is not worth his time, then don't take it against him....
we communicate once in a while about parts and stuff...btw, i came to know him thru pdvd....
add to that is the fact that when a unit has been tampered with,
the repair then becomes a matter of board replacement....
Guys like Nelson Pass and maybe John Curl buy parts by the hundred thousand pieces,
so that they have a lifetime supply of parts....few guys can afford that for sure....
sir, ypgm...
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Jun Medina is a Japanese trained tech used to work at Sansui Service Center
at VV Soliven towers before, so he is qualified....he tells me he is swamped with work....
the problem very common with vintage gears is parts availability as many of the semicons
have become obsolete due to age...simply not available anymore....
So if he thinks that your unit is not worth his time, then don't take it against him....
we communicate once in a while about parts and stuff...btw, i came to know him thru pdvd....
add to that is the fact that when a unit has been tampered with,
the repair then becomes a matter of board replacement....
Guys like Nelson Pass and maybe John Curl buy parts by the hundred thousand pieces,
so that they have a lifetime supply of parts....few guys can afford that for sure....
sir, ypgm...
No question about his claimed expertise in repairing Sansui, it's actually how he accommodates inquiries.
He's sarcastic in that manner, which you will be surprised as customer.
His famous statement "kung wala kayo tiwala eh di pagawa nyo na sa iba"....that's his usual response every time a customer will ask "do you think may chance to repair my unit". By which you'll just be surprised.
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^perhaps you caught him in a bad time, our conversations so far have been
very jovial, he has another job in another shop and attends to repairs after his day job...
i supply him with power trannies and some tips....
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Whether an expert or not, it's how a person answers back to a customer seeking help or assistance.
IMHO
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^perhaps you caught him in a bad time, our conversations so far have been
very jovial, he has another job in another shop and attends to repairs after his day job...
i supply him with power trannies and some tips....
Maybe he respects you because of your deep technical knowledge.
I've heard same complaints from other people seeking services from him.
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you have point there.....will give him feedback when he drops by the house...
you have to understand also that lots of time, repairs can be just as frustrating to technicians more than the end users.....
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you have point there.....will give him feedback when he drops by the house...
you have to understand also that lots of time, repairs can be just as frustrating to technicians more than the end users.....
I hope he does. Small lang audio community kasi.
Most often than not, we as end users needs the aid of technicians.
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My SANSUI AU-999 sings with SONY CDP-X55es and EPOS ES14 speaker
(http://i1299.photobucket.com/albums/ag61/baletlet/20150315_102009_zpskpyu3i3z.jpg) (http://s1299.photobucket.com/user/baletlet/media/20150315_102009_zpskpyu3i3z.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/20150315_102100_zpseyuqnh7z.jpg) (http://s1299.photobucket.com/user/baletlet/media/20150315_102100_zpseyuqnh7z.jpg.html)
(http://i1299.photobucket.com/albums/ag61/baletlet/20150315_102301_zpseo7ldpjx.jpg) (http://s1299.photobucket.com/user/baletlet/media/20150315_102301_zpseo7ldpjx.jpg.html)
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Up ko lang yun thread...
May nakita ang tatay ko na Sansui AU-V7000 sa isang surplus shop dito sa amin. Binebenta niya ng 5k lang ata sa pagkakasabi niya sa akin. Problem lang eh worn out daw yun wood sidings niya. Good buy na kaya ito?
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AFAIK Sansui did not make good AV receivers. I could be wrong though.
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not in the tradition of their vintage stuff....
i will not even be surprised kung gawang china yan....
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The AU-V7000 is an authentic Sansui amp released before the Japanese company closed down and among the limited number of AV receivers/amps produced. Here's the reference from an online Japanese vintage audio directory: http://www.audio-heritage.jp/SANSUI/amp/au-v7000.html. At almost 100,000 yen price, that would be equivalent to other AV amps sold in the US at a range of $1,000-$1,500 (maybe from P70k to P90k here with the huge margins of local retailers).
In my experience, the original Sansui AV line, which is so different from the China-made Sansui branded electronics, sounds surprisingly superior than comparable models released by other Japanese AV brands.
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Up ko lang yun thread...
May nakita ang tatay ko na Sansui AU-V7000 sa isang surplus shop dito sa amin. Binebenta niya ng 5k lang ata sa pagkakasabi niya sa akin. Problem lang eh worn out daw yun wood sidings niya. Good buy na kaya ito?
panalo pala yan kung 5k lang!!! madali palitan wood sidings nyan. get it na sir baka maunahan pa ng iba hehehe!
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many of the famous american brands like Fisher, Marantz, etc, used offshore manufacturing and Tamura Radio Corporation of Japan got to build many of them.....i wonder if Sansui used Tamura Radio as well...
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Salamat sa mga sumagot.
I have yet to see the receiver in person. Bukas ko siya makikita doon sa nagtitinda. Try ko kunan ng pics kung pwede. Sasabihan ko na tatay ko na mag-prepare na siya ng pera pambili nun or else uunahan ko siya hahaha!
Sabi pa sa amin nung nagtitinda niyan, meron pa siyang isang Sansui, AU-67x ata ang pagkakasabi niya. Sabi ko nga sa tatay ko, maganda kung madadala nung seller yun doon sa amin nang makilatis
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many of the famous american brands like Fisher, Marantz, etc, used offshore manufacturing and Tamura Radio Corporation of Japan got to build many of them.....i wonder if Sansui used Tamura Radio as well...
Tamura I believe was a transformer supplier to Sansui for many years. But the biggest supplier was Hashimoto.
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Tamura I believe was a transformer supplier to Sansui for many years. But the biggest supplier was Hashimoto.
Bando, a malaysian based japanese transformer maker did most of the traffos for many japanese amps during the later years.....https://www.tamura-ss.co.jp/en/corporate/profile.html
Hashimoto used to supply traffos for Sansui tube amplifiers...very excellent maker....
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Ok, here's the AU-V7000 in person
(http://scontent-sin1-1.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/11855728_10206282755440606_7518383640390050720_n.jpg?oh=eccb46de70ab24fa575fa8a146aacdfd&oe=56383F2C)
(http://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xpf1/v/t1.0-9/11061229_10206282755840616_1870210660650968045_n.jpg?oh=9642a81b1dcd51212fa9f468955546ae&oe=564A708C&__gda__=1447547635_411e43c6cdc76c0483c694f99f1b9f99)
Ni-audition na rin namin. Kaso sabi ng erpats ko, parang sabog daw ang rear. Tapos pansin niya, pag nilipat yun jumper, tsaka gaganda yun output ng rear. Concern pa niya, kung ganun ang output ng rear, what more pa pag nag 5.1 config daw. Ewan ko kung tama ang sinasabi niya.
Meron pa daw binebentang AU-607 yun may-ari. Sabi ko nalang eh dalhin sa Sunday nang ma-audition at makilatis.
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Sharing my Sansui vintage setup:
Sansui AU-7500 amp
Sansui TU-7500 tuner
Klipsch Tangent 5000 speakers
Schiit Modi Uber DAC - connecting my iPad and NAD CD player.
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Hello, could anyone here use Sansui AU-D907G Extra and Sansui AU-D11ii...
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May tanong si Amar Bose sa Facebook on upgrading his Sansui amplifier. Baka may gustong sumagot.
https://www.facebook.com/groups/48083555596/?pnref=lhc
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May tanong si Amar Bose sa Facebook on upgrading his Sansui amplifier. Baka may gustong sumagot.
https://www.facebook.com/groups/48083555596/?pnref=lhc
mabigat ang tanong nya.....and since hindi ko nahawakan, wala akong comment....
like any other japanese amps, merong fad cycles, makers of transistor devices
comes up with base designs as to how to use their devices, all engineered to boost sales...
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so sad when our house was being repaird by sister gave a Sansui AU 717 to the carpenter. I asked why she said it is faulty and no one is using it. damn she was not aware how much is this. was really hearbroken as this was bought by dad when he went to a conference in japan in 1980. i am now here in NZ doing some buy and sell. I was able to get a AU217 and a LM110 speaker for NZD 50! they are really good. planning to keep but need to pay mortgage so need to sell.
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my sansui au alpha607 amplifier is now having problem. the power indicator would blink continously in red , and would not turn into green which is the usual. What could be the problem? will i have to bring it to a technician? tnx.