Author Topic: SAKURA AV-200T Tube Amp  (Read 353767 times)

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Offline night_rain

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Re: SAKURA AV-200T Tube Amp
« Reply #1230 on: Feb 23, 2017 at 01:02 PM »
thanks sir tony...

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1231 on: Feb 24, 2017 at 07:39 AM »
welcome.....:D
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1232 on: Mar 04, 2017 at 01:45 PM »
Hi, Nice to meet you Anthony and all! I am J, an old DIY tinkerer. Just picked up this amp here in TH and it looks to be stock, although the seller got it from Manila and mentioned Rene and led me to believe he built it.
8-(  Big let down...  :(

But inside the bottom it is signed in magic marker,
"VOL.Cuhol
12-6-12"
The u could be 'a' or something. Any ideas on that?

Could I bother you for some advice/help?

Could you give me a few mods to tweak this av200t? It seems to be an early model, but the speaker pop relay is black, not orange like mentioned in the thread. I read something about a tweak that would increase output by 20 watts or so, but can't find it now.

All replies appreciated!
J
Marantz/PSB/Oppo/SVS/Sony VPL-40es Fan

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1233 on: Mar 04, 2017 at 03:52 PM »
the only mod that i did and recommend is to parallel the sections of the 6n2 dual triode, small tubes in front...this is a design flaw that leads to cathode poisoning that u have seen in at least 3 units that was brought to me...

power remains the same using the same power traffo...
the connectors feeding the filaments can burnout in time,,,the color of the relay makes no difference as long the speaker delay worked...

fyim i turned down a lot of requests modding this amp,
i told them bring the amp to me when it no longer worked,
otherwise just leave it alone and use it...
« Last Edit: Mar 04, 2017 at 03:53 PM by tony »
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Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1234 on: Mar 04, 2017 at 04:15 PM »
Quick answer appreciated, thank you Mr. Tony!

I asked about the signing inside as I was told this was a built version. Does anyone here sign and date their work?

All the caps look stock, but there is something odd on the pcb. It looks like someone has laid down a thin line of solder following many of the traces. They must have had a steady hand, that's for certain! Ever seen such a thing?

I will read more and see if I can figure out how to 'parallel the sections...' you mentioned.

I mentioned the relay color as a help to identify a version or age of this thing. One 4700u cap is loose, I'm hoping that will solve the one bad channel problem.

Cheers!
J



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Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1235 on: Mar 04, 2017 at 04:31 PM »
Did I mention mine has the 'Sakua' sticker on the back? Here is the SS section. Stock, correct?
J

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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1236 on: Mar 04, 2017 at 04:35 PM »
 in all likelihood they used wave soldering machine on those boards,
if you can
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1237 on: Mar 04, 2017 at 04:37 PM »
And here are the soldered traces I mentioned. Does anyone else have this? I've never seen it!
All comments welcomed.
Thanks,
J
Marantz/PSB/Oppo/SVS/Sony VPL-40es Fan

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1238 on: Mar 04, 2017 at 04:37 PM »
these are the early versions, the latest ones i saw did not have speaker delay relay and used vertical sub boards on the main power amp board...

Did I mention mine has the 'Sakua' sticker on the back? Here is the SS section. Stock, correct?
J


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Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1239 on: Mar 04, 2017 at 04:55 PM »
Does that speaker delay mess with the output signal? What are your thoughts on those soldered traces?
thanks again,
 ;)
J
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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1240 on: Mar 25, 2017 at 06:30 AM »
^^i do not think so.....

i was at deeco raon yesterday and they have on display the AV-200 with a tag price of 4795 pesos....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline fantom_mayonaise

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Re: SAKURA AV-200T Tube Amp
« Reply #1241 on: Mar 26, 2017 at 10:51 PM »
Anybody has the schematics of this amplifier? I have one unit now and the volume from the L and R channels are not the same. Seems a good time to do some mods starting with the amp board.

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1242 on: Mar 27, 2017 at 07:01 AM »
replace the input caps of the power amp board with a film cap type...
the power amp input ecap could be leaky, a 1ufd film cap will do nicely,......

while you are at it, parallel the miniature tube unused pins, 1//6; 2//8; 3//8.....
less ecap to worry about.
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline scumbads

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Re: SAKURA AV-200T Tube Amp
« Reply #1243 on: Apr 10, 2017 at 11:17 AM »
how about sir tony yung mas maliwanag yung isang tube na malaki compare sa tube na isa, like say yung left tube mas maliwanag compare mo sa right tube? may problema po ba yug amp or yung tube lang?

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1244 on: Apr 10, 2017 at 01:41 PM »
as long as the sound is right, no worries...
yours is a typical newbie reaction, there will be more,
just keep asking...

how about sir tony yung mas maliwanag yung isang tube na malaki compare sa tube na isa, like say yung left tube mas maliwanag compare mo sa right tube? may problema po ba yug amp or yung tube lang?
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline scumbads

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Re: SAKURA AV-200T Tube Amp
« Reply #1245 on: Apr 10, 2017 at 09:07 PM »
thanks sir tony, i was relieve maraming salamat po.

Offline Benturbo

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Re: SAKURA AV-200T Tube Amp
« Reply #1246 on: Apr 11, 2017 at 07:59 PM »
Got my new Sakura V-225t vacuum amp at raon, swabe ang tunog this is the upgrade version of the V-200t. Mas malakas ng konti kc 225 wpc na to. Very happy with my purchase at 4,700 pesos😊

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1247 on: Apr 12, 2017 at 07:52 AM »
saang store yan?
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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1248 on: Jun 28, 2017 at 08:44 AM »
saang store yan?


me nakita ako sa DEECO na ganyan, below 5k ang price...

meron din sa LAZADA......http://www.lazada.com.ph/sakura-av-225t-vacuum-tube-amplifier-16259791.html?ff=1

COD pa, and delivered right to your doorstep....

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Offline jerix

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Re: SAKURA AV-200T Tube Amp
« Reply #1249 on: Aug 07, 2017 at 11:47 AM »
How much would a basic tube amp costs? Me nabibili ba na stock or talagang dapat mag pa DIY? Thanks po!
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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1250 on: Aug 07, 2017 at 12:06 PM »
kits coming out of china, meron din na gawa na from china...
contact Joel Herrera of facebook and his Econolytez page for more info..
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline jerix

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Re: SAKURA AV-200T Tube Amp
« Reply #1251 on: Aug 07, 2017 at 04:03 PM »
Kuya can you give me an estimate please?
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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1252 on: Aug 07, 2017 at 04:12 PM »
i have no idea on china costs, this sakura amp is a good entry level amp...
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Offline jerix

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Re: SAKURA AV-200T Tube Amp
« Reply #1253 on: Aug 07, 2017 at 06:22 PM »
Thanks po! So plug n play na yang sakura. No more component to change.
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Offline scumbads

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Re: SAKURA AV-200T Tube Amp
« Reply #1254 on: Aug 29, 2017 at 04:15 PM »
sir tony may posibilities na mag run to into pure tube sounding?

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1255 on: Aug 29, 2017 at 04:23 PM »
sir tony may posibilities na mag run to into pure tube sounding?

hybrid kasi yan, ss amp ang nagda drive sa speakers, yung tubes pang gulat lang  sila sa amp na yan...

kaya nga mura eh....
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Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1256 on: Sep 02, 2017 at 10:44 AM »
Update: Took my "Sakua" (no 'r') 200T in to an (old) old school guy I found in BKK for the 'no output at all' problem. He couldn't find the problem right away, so spent a few days on it. Changed the 4 transistors, the 4 big resistors, various caps...  :o
But got it working fine.  :)
Cost me 1000Bt (1500PHP) but I never would have figured it out myself.  :o
He couldn't understand me about the small tube jumpers, so I will do that myself... later.

Thanks again!
Marantz/PSB/Oppo/SVS/Sony VPL-40es Fan

Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1257 on: Sep 02, 2017 at 10:58 AM »
Update: Took my "Sakua" (no 'r') 200T in to an (old) old school guy I found in BKK for the 'no output at all' problem. He couldn't find the problem right away, so spent a few days on it. Changed the 4 transistors, the 4 big resistors, various caps...  :o
But got it working fine.  :)
Cost me 1000Bt (1500PHP) but I never would have figured it out myself.  :o
He couldn't understand me about the small tube jumpers, so I will do that myself... later.

Thanks again!

did you check out if your speakers burned out?
with output transistors burned like that, speakers are suspect...
if your speakers survived and did not burn out, i will call that luck....
was that really the problem? could be after all the relays were
there just to delay the speaker connections and not to
protect them...

just about any 6 volt twin triodes will work here, 6bq7, 6bk7, 6aq8, 6dj8 and siblings, even the 7dj8 will do...

jumper pin 1 and pin 6, pin 2 and pin 7, pin 3 and pin 8, doing so doubles your transconductance and lowers distortion some more...

have fun.....


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Offline JThaiHT

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Re: SAKURA AV-200T Tube Amp
« Reply #1258 on: Sep 02, 2017 at 01:10 PM »
Aack! I'm glad my DIY design full-range speakers didn't burn up! Maybe the guy I bought this from burned his speakers?


I also found NOS tubes in Bangkok chinatown. I picked up 6r-hh2 which is the same as 6dj8 I think. Don't know how they compare as just got the amp working. http://tubedata.milbert.com/sheets/133/6/6R-HH2.pdf



The guy used the same transistors, D781. Would the lm1875 or something sound any better?
example http://www.diyaudio.com/forums/chip-amps/123255-beginners-gainclone-hifi-lm1875-amplifier-board.html

Cheers!
« Last Edit: Sep 02, 2017 at 01:16 PM by JThaiHT »
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Offline tony

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Re: SAKURA AV-200T Tube Amp
« Reply #1259 on: Sep 02, 2017 at 08:36 PM »
6rhh8 or 6rhh1 can also be used...

lm1875 is a different beast altogether, your power amp section is made up of discretes......

but if you want to replace the ss amp board, better go with the lm3886 instead...

note also that the ss amp board provides regulated +-12 volts to the tone control/buffer boards...
« Last Edit: Sep 03, 2017 at 08:21 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....