Author Topic: Konzert AV-502A - Fake ba ito or Original? (Read 44947 times)

Stagea · « **Reply #30 on:** Jan 14, 2013 at 11:30 PM »

Quote from: armymanhaha on Jan 14, 2013 at 01:32 PM

Kind of OT, but in the spirit of the topic, I think this is worth mentioning:

I wish I took innard pictures of my Yaqin Vk2100 back then when I had it almost a year ago. The inside was total trash compared to what they show on the net. My Vk2100 used laminated transformers (is that what you call it?) rather than toroidals shown on the net, and also utilized no-brand capacitors. With that being said, it still sounded great and sometimes preferred it over a Rotel 1520.

Hindi ba ganito innards nung dating sayo?

armymanhaha · « **Reply #31 on:** Jan 15, 2013 at 01:04 AM »

short answer: nope.

long answer: it does share a lot of similarities (same layout) but also a lot of differences. to be specific, the one i had did not have most of stuff that is beside the transformer on the pic above (i whish i know what those are for). that amp also seem to use better quality components inside. The yaqin I had before just said in plain bold text 'AUDIO' for its capacitors, and did not have the green thing beside the tubes (sorry dont know what those are)

Probably there is just inconsistency between the samples but the differences are alarming.

ATJr. · « **Reply #32 on:** Jan 15, 2013 at 07:13 AM »

the green thing are russian PIO's, paper in oil coupling caps....

FWIW, amplifier designs change in the course of its life/production cycle, and depends on material cost-availability considerations....this is normal......consumers do not know this....

JojoD818 · « **Reply #33 on:** Jan 15, 2013 at 07:29 PM »

@armymanhaha

Post some photos please.

Like your Yaqin I've seen some pretty nasty tube projects in my life and what's worse is the builder/manufacturer claims otherwise.

armymanhaha · « **Reply #34 on:** Jan 15, 2013 at 07:58 PM »

Quote from: JojoD818 on Jan 15, 2013 at 07:29 PM

@armymanhaha

Post some photos please.

Like your Yaqin I've seen some pretty nasty tube projects in my life and what's worse is the builder/manufacturer claims otherwise.

twas sold a long time ago. i dont have it at hand.

JojoD818 · « **Reply #35 on:** Jan 15, 2013 at 08:53 PM »

Quote from: armymanhaha on Jan 15, 2013 at 07:58 PM

twas sold a long time ago. i dont have it at hand.

I see. Back reading, it was good that you still enjoyed it while it was with you.

Cheers

allan1836 · « **Reply #36 on:** Jan 17, 2013 at 12:51 PM »

I recently acquired a NOS 502a in a store in raon. It is the last piece daw and on sale for 2.9K but since they don't have the box na and looks a bit dirty, I huggle for the price and the owner gave it at 1.8K ! When I tested it at the shop, compared to other chinese amps they have, it stood out, sounding more like a japanese amp, a classic marantz if I may. The sound was warm, full bodied but has clarity and detail, considering the fact that a cheap chinese speakers were used also.

Now what puzzled me was the brand of this 502a is not Konzert but BSE7VEN (you decipher it)

. I checked the innards and looks the same as the konzert posted here, in fact, this BSE7VEn uses 8 pcs. of Toshiba output transistors. Now I'm assuming this 502a amp is not exclusive for Konzert but, in fact, an OEM product that can be labeled to any brand which acquires it. The fascia , back and innards of the amp is a replica of the Konzert 502a, though the emblem and stamp name on the top cover is BSE7VEN.

But I'm not compalining but merely stating the fact that Konzert products are also off the shelf modelsand not exclusive design for them.

ATJr. · « **Reply #37 on:** Jan 17, 2013 at 01:06 PM »

no surprises there.....you can go to China and to the factory making those Sakura amps, they are also called OEM,(Original Equipment Manufacturer) you can then asked the factory to put any brandname you like on the front faciA........

even in the 70's US brands manufacturer turned to japanese factories like the Tamura radio corporation to manufacture Marantz, Fisher, Scott etc for them, this is bussiness....

then later, they turned to Korea, and then Taiwan, and now China....

you may be surprised if your highly acclaimed speakers you are using were made right here by DaiIchi......

Quote

I huggle for the price and the owner gave it at 1.8K !

so that means that unit cost was probably in the 1k range....

allan1836 · « **Reply #38 on:** Jan 17, 2013 at 02:55 PM »

Sir Tony, I'm not sure of the pricing but I notice may damaged konti sa mic volume knob nya , medyo out of alignment at nakalubog, so that's why they gave it too me that cheap or probably the production cost of the amp is really that cheap.

Mind you, I'm still amazed at the performance I get from this amp relative to it's price.

av_phile1 · « **Reply #39 on:** Jan 17, 2013 at 05:17 PM »

Indeed, about the only expensive single component in a power amp is the transformer. A DIY hobbysts who knows his stuff can assemble a 100w RMS stereo power amp for around 1T.

You could earn money from this amp.

Replace the transformer with a toroid, get large black anodized heatsinks and reposition the power transistors to the sides of the chassis. Replace the back plate and spring clips of the speaker outs to fake gold plated terminals, replace the power chord with a thick detachable one. Then make a beautiful brushed aluminum face plate that is 1-inch thick with the name Mark Levinson or Bryston on it, and you can sell this amp to some moneyed, ignorant but brand-conscious audiophile for P120,000 which is already cheap for these brands. He he

Naughty, naughty. You just need to do some research on what brand to copy.

ATJr. · « **Reply #40 on:** Jan 17, 2013 at 08:38 PM »

LOL!!! as Peter Barnum puts it, there are suckers born every minute....

Stuart Yaniger of Diyaudio, just tested a Baybee Quantum purifier....he confirmed that it is made up of a 0.25 ohm resistor.....

leiann · « **Reply #41 on:** Jan 24, 2013 at 11:48 PM »

Meron ako na repair na 502 na konzert ung nauna labas dawala ung transformer nya at apat na malaki filter capacitor, Un ang original ung mga single na tran4rmer un na ung mag Imitation.

markcrenz · « **Reply #42 on:** Jan 25, 2013 at 05:48 PM »

Quote from: TonyT on Jan 17, 2013 at 08:38 PM

LOL!!! as Peter Barnum puts it, there are suckers born every minute....

Stuart Yaniger of Diyaudio, just tested a Baybee Quantum purifier....he confirmed that it is made up of a 0.25 ohm resistor.....

Phineas Taylor Barnum?

ATJr. · « **Reply #43 on:** Jan 25, 2013 at 06:25 PM »

Quote from: markcrenz on Jan 25, 2013 at 05:48 PM

Phineas Taylor Barnum?

my bad...this barnum...http://en.wikipedia.org/wiki/Phineas_Taylor_Barnum

realsteel · « **Reply #44 on:** Jan 25, 2013 at 09:12 PM »

OT: will this work mga sir?

HDTV - NMT - konzert 502a - external speakers (as fronts)e.g. polk owm3. i dont have center, sub and surrounds/rear. all mkv-dts will work here right? thanks!

JojoD818 · « **Reply #45 on:** Jan 26, 2013 at 09:29 AM »

no, 502a has no decoder. if you use rca interconnects then it will only be downmix stereo.

you need a proper receiver if you want dts/ac3 etc.

realsteel · « **Reply #46 on:** Jan 26, 2013 at 10:21 AM »

Quote from: JojoD818 on Jan 26, 2013 at 09:29 AM

no, 502a has no decoder. if you use rca interconnects then it will only be downmix stereo.

you need a proper receiver if you want dts/ac3 etc.

i guess im ok with the stereo output for now

i'll take note of that! thanks a lot!

diy_master · « **Reply #47 on:** Apr 04, 2013 at 12:56 PM »

Konzert, Crown and Sakura, ay isang company lang dati, nang kumita na ang bawat isa nag sarili na. May mga fake na Konzert at Crown na limalabas at lahat made in china. Mahirap masabi ang diff. ng fake at orig dahil magaling ang pang clone ng china. pero kung gusto mo malaman ang fake at orig. dalhin mo ang amp sa raon at hanapin mo ang "Martcom" halos katabi ni Deeco at Alexan. Sila kasi ang Malaking Importer ng Konzert dito sa pinas.

onkyo616 · « **Reply #48 on:** Apr 11, 2013 at 03:01 PM »

Quote from: JojoD818 on Jan 26, 2013 at 09:29 AM

no, 502a has no decoder. if you use rca interconnects then it will only be downmix stereo.

you need a proper receiver if you want dts/ac3 etc.

Can this Konzert 502 able to drive the RTI A7 polk audio speaker for stereo listening kasi pagkakaalam
ko ang Konzert na eto eh 500watts tama po ba, or shall i say maganda bang gamitin eto sa RTI A7 polk speaker for stereo listening lang

tnx.........

markcrenz · « **Reply #49 on:** Apr 11, 2013 at 07:08 PM »

sayang naman polks kung konzert pang-drive. around 100 watts at 8 ohms, 150 at 4 ohms. definitely NOT 500 watts. the transformer secondary has only 34VAC, so it has about 47 volts DC on its rails, di pa natin sure how much the voltage sags at high power.

vhinx · « **Reply #50 on:** Apr 12, 2013 at 11:22 AM »

Quote from: onkyo616 on Apr 11, 2013 at 03:01 PM

Can this Konzert 502 able to drive the RTI A7 polk audio speaker for stereo listening kasi pagkakaalam
ko ang Konzert na eto eh 500watts tama po ba, or shall i say maganda bang gamitin eto sa RTI A7 polk speaker for stereo listening lang

tnx.........

Bro, kaya i-drive ng konzert yan polk speaker mo, pero posible na hindi ka ma satisfied sa overall sounds stage lalo pag malakas na tugtugan... The konzert 502 before drive at max output of 80watts rms @ 8ohms only, the 550watts indicating on amplifier was PMPO - Peak Music/Momentary Power Output, it means over all wattage computation na kasama na dyan yun transformer, all power transistor's, IC's and etc...

JojoD818 · « **Reply #51 on:** Apr 12, 2013 at 11:44 AM »

Quote from: onkyo616 on Apr 11, 2013 at 03:01 PM

Can this Konzert 502 able to drive the RTI A7 polk audio speaker for stereo listening kasi pagkakaalam
ko ang Konzert na eto eh 500watts tama po ba, or shall i say maganda bang gamitin eto sa RTI A7 polk speaker for stereo listening lang

tnx.........

It can drive it if that is the question, it will play no problem, but you may or you may not like the overall sonics.

500W? I seriously doubt it.

Nelson Montero · « **Reply #52 on:** Jun 17, 2014 at 10:37 PM »

ang orehinal na KONZERT yung malalaki ang case o kaha dual fan at 20k ang timbang,

may isang made nyan ng china na na gumawa sila nyan pero walang fan at kasi malalaki hit-sink

tayo kasi may nabibili board ng china toshiba transistor powerd naman kasso hindi na sanken yung sa orihinal pero ganun paman ang mahalaga tumutunog

konzert na amp av502 naka disign ang 12-15 inch na speaker plus equalizer.

pero kung ang konzert mo lalagyan mo ng

mixer

crossover

equalizer

lalakas ang tunog pero hindi nati alam kung tatagal ang component

Nelson Montero · « **Reply #53 on:** Jun 17, 2014 at 11:02 PM »

ang orehinal na KONZERT yung malalaki ang case o kaha dual fan at 20k ang timbang,

may isang made nyan ng china na na gumawa sila nyan pero walang fan at kasi malalaki hit-sink

tayo kasi may nabibili board ng china toshiba transistor powerd naman kasso hindi na sanken yung sa orihinal pero ganun paman ang mahalaga tumutunog

konzert na amp av502 naka disign ang 12-15 inch na speaker plus equalizer.

pero kung ang konzert mo lalagyan mo ng

mixer

crossover

equalizer

lalakas ang tunog pero hindi nati alam kung tatagal ang component

markcrenz · « **Reply #54 on:** Jun 18, 2014 at 08:02 AM »

same amp and speakers, mapapalakas ng mixer, crossover at equalizer ang tunog? paano?

AppleMan · « **Reply #55 on:** Jun 21, 2014 at 05:33 AM »

^_Overdrive ang labas lalakas yung overdriven audio output...lol!

tony · « **Reply #56 on:** Jun 21, 2014 at 08:13 AM »

Quote from: av_phile1 on Jan 17, 2013 at 05:17 PM

Indeed, about the only expensive single component in a power amp is the transformer. A DIY hobbysts who knows his stuff can assemble a 100w RMS stereo power amp for around 1T.

You could earn money from this amp.

Replace the transformer with a toroid, get large black anodized heatsinks and reposition the power transistors to the sides of the chassis. Replace the back plate and spring clips of the speaker outs to fake gold plated terminals, replace the power chord with a thick detachable one. Then make a beautiful brushed aluminum face plate that is 1-inch thick with the name Mark Levinson or Bryston on it, and you can sell this amp to some moneyed, ignorant but brand-conscious audiophile for P120,000 which is already cheap for these brands. He he Naughty, naughty. You just need to do some research on what brand to copy.

sorry.....not true any more....
today, DIY is more expensive, with the influx of cheap China goods,
take the Sakua AV200, it has tubes, and unbeatable in price....

Nelson de Leon · « **Reply #57 on:** Jun 21, 2014 at 12:49 PM »

Quote from: markcrenz on Jun 18, 2014 at 08:02 AM

same amp and speakers, mapapalakas ng mixer, crossover at equalizer ang tunog? paano?

Same question.

tony · « **Reply #58 on:** Jun 21, 2014 at 01:17 PM »

taasan mo yung volume level, di ba ganoon lang yon?
pwede namang hinaan at lakasan yan di ba?

our tagalog word "lakas" can mean one of two things,
power capacity or SPL, these are two different things...

AppleMan · « **Reply #59 on:** Jun 21, 2014 at 10:28 PM »

^_correct