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26th February 2007, 05:22 PM
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#1 |
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diyAudio Member
Join Date: Nov 2006
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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? Thanks! |
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27th February 2007, 04:06 AM
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#2 | |
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diyAudio Member
Join Date: Dec 2002
Location: Left of the Dial
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Re: Loud POP 555mkII moderate volume.
Quote:
 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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28th February 2007, 01:02 AM
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#3 |
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diyAudio Member
Join Date: Nov 2006
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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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