[mrarroyo]

Mocca, sorry about your troubles. Based on the pictures it sure looks like a couple of your outpurt transistors are burnt.

The good thing is you are in contact w/ Mike. He will be able to fix your amp even if he has to use wire to jump over damage traces in your pc board.

The big question is why did your transistors failed?

 

[Pricklely Peete]

Quote:

Originally Posted by mrarroyo /img/forum/go_quote.gif The big question is why did your transistors failed?

This is the million dollar question.

Peete.

 

[atbglenn]

Could have been a cold solder joint at the output device causing it to build up heat, then thermal runaway....ouch

 

[earthflyer]

Quote:

Originally Posted by Mocca /img/forum/go_quote.gif Yeah I did uplug it but perhaps it was to late... I just took some photo by my webcam as I don't have a DC... it is not very good quality but hope this might give a glue And at the back it seems that part of it was burnt... if it is really the case what can I do? I am now in London, is there any place I can take it to repair? Many thanks.

From the last pics, in the transistor area, there seem to be alot of linkage between each soldering point. it seem to me that the previous owner burn out the tread line and now using solder to link each tread link together. Maybe this burned out the transistor in long run or maybe short circuit due to solder flux.