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Need a person in EU to repair my B22

post #1 of 17
Thread Starter 

 

 

Hello, 

 

I have buy a 4 channel B22 preamp/amp from a american seller, it is to american voltage. It tooks me the recommandation to never plug and unplug a headphone when the amp is on power on.

 

However I did this thing, I have my HE6 plugged in one input and my HD800 plugged on the second input, I had unplug the HD800. A wire has burning inside the amp. 

 

I have only the sound from the left channel on the headphone. 

 

Its seems that only the preamp had been affected, a wire has burn, 2 resistors, and one of the black thing that is it on the image below

 

http://www.amb.org/audio/beta22/_b22ban.jpg 

 

I need somebody to fix it 

 

Here is a photo to show 

 

Best regards


Edited by Hun7er - 1/20/13 at 2:51pm
post #2 of 17

Where are you?

 

w

post #3 of 17
Thread Starter 

I'm from France ;)

post #4 of 17

OK, best for somebody local to take this on...

 

w

post #5 of 17

HUN7ER- Could you tell me the active component BJT/Moss-Fet/etc that is burnt out And I can maybe help you that is if you can use a soldering iron and know your way round a circuit board

You posted a link to the circuit diagram  which I copied so I could work from that if it includes the section which is faulty.

If the instructions say do not unplug headphones while it is on it  might mean  the headphone plug "goes short circuit" when unplugged[unlikely ]  OR-The act of unplugging it causes a short to appear across the out-put.

Je parle Francais une peu. so sorry cant do too much translation.
 

post #6 of 17
Thread Starter 

duncan1, I can tell you what component had been affected. As I said I didn't know nothing about electronic and I need a person In EU to repair it. I will pay for the postage fee, component and for the hours the personn work it.

 

Regards

post #7 of 17

You might have better luck to find someone able to help you in France on homecinema-fr.com (diy section). It might be worth a shot to ask on diyaudio.com and groupdiy.com too.

 

If you're near Paris, I could have a look on the the amplifier but only after the summer.

post #8 of 17
If you live in the south west, then I'd certainly be happy to look at it. I'm free most of the summer.

Seems odd that the cascode fet has blown. I thought that it was usually one of the main drivers if it was short related.
Edited by Goobley - 6/24/13 at 1:25am
post #9 of 17
Thread Starter 

up

post #10 of 17

I'm in the US, but my grandfather could take a look at it. He's a electronics tech, been working in the field for 25+ years. He ran his shop for a while too, I believe around 15 years fixing audio equipment etc. He and I are building a M^3 which he considers trivial and stupid, but he loved the beta22 schematic. It's up to you if you want us to fix it. I have trader feedback as well.

 

Keep in mind though, voltage differences, as well as postage (shipping to us is like 50-70USD or Euro back and forth.

 

Perhaps you should look for electronic techs in your area? Show them the schematic and see if they can work on it. 

post #11 of 17
Thread Starter 

Hello,

 

Thank for you proposition but the postage fee will be huge

post #12 of 17

Have held back saying this but that's one scary looking build.  I know beta22s well & don't know what the heck is going on with the wiring there...  No connection to Output, but connections to R34/R35 leads, wire extensions w/tape + zipties.  And fried FETs like that on a beta22 board often cause or indicate problems elsewhere on the board (hours of diag + repair).

 

You might not like to hear this but you should consider taking more pictures & selling the thing in the FS forum for parts (as damaged, referencing this thread).  Any respectable DIYer capable of fixing it would also want to re-work the build to make it correct & reliable, and its difficult/impossible to know in advance how many hours that would take.  I'm speaking from experience here.

 

Good luck.

post #13 of 17
Quote:
Originally Posted by cfcubed View Post
 

Have held back saying this but that's one scary looking build.  I know beta22s well & don't know what the heck is going on with the wiring there...  No connection to Output, but connections to R34/R35 leads, wire extensions w/tape + zipties.  And fried FETs like that on a beta22 board often cause or indicate problems elsewhere on the board (hours of diag + repair).

 

You might not like to hear this but you should consider taking more pictures & selling the thing in the FS forum for parts (as damaged, referencing this thread).  Any respectable DIYer capable of fixing it would also want to re-work the build to make it correct & reliable, and its difficult/impossible to know in advance how many hours that would take.  I'm speaking from experience here.

 

Good luck.

 

Agreed

 

I still have the one I've been trying to fix...

post #14 of 17

Think this is a Fallen Angel build that's been basterdized, ahem, messed around with.   Curiosity got the best of me while waiting for dinner.

It had better days:  http://www.head-fi.org/t/643575/wtt-fully-balanced-fallen-angel-beta-22-for-woo-audio-wa22

At one time it was the right below, now its the sorry looking left below:

 

 

Anyway, recommendation stands.  Maybe someone would feel sorry for it, help it along to recouperation & give it a nice home:)

post #15 of 17
Quote:
Originally Posted by cfcubed View Post

 

Anyway, recommendation stands.  Maybe someone would feel sorry for it, help it along to recouperation & give it a nice home:)


Too bad it's so far away. I would pick it up but shipping would be crazy.

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