Loud POP 555mkII moderate volume.

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Once in a while in a transient peak, I get a loud pop output.
It does not sound like clipping, just that loud POP. What should I look for?
Otherwise the amp sounds great. I have tried other speakers, same problem.
It does not light up the clipping LED when it happens.
Anyone got a good guess?
Thanks!
 
digital desire said:
Anyone got a good guess?
How about just a guess (as opposed to a good one)? :D You may have a transistor with a damaged P-N junction...they can pop and sputter intermittently. Freeze-spray and/or a heat gun may help narrow down the section of the amp where it is occuring.

It is also possible that you have a cold solder joint somewhere, but Adcom amps are not frequently known to suffer from these, with the possible exception of areas where components get hot.

Do check R109 and R159: these 22.1K resistors are being operated right at their power limit...best to replace with 1/2W parts.
 
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