Loud POP 555mkII moderate volume. - diyAudio
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Old 26th February 2007, 04:22 PM   #1
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Join Date: Nov 2006
Default Loud POP 555mkII moderate volume.

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?
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Old 27th February 2007, 03:06 AM   #2
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Default Re: Loud POP 555mkII moderate volume.

Originally posted by digital desire
Anyone got a good guess?
How about just a guess (as opposed to a good one)? 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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Old 28th February 2007, 12:02 AM   #3
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Thanks for the "guess"!
I will try to load it up and squirt the transistors with the spray!
I really wish I had better test equipment...
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