It does sound like it is perhaps a dirty or bad volume control, since you can make it go away, but before you do anything, you should first positively isolate the amp. It is easy since it is only in one channel. swicth the channels, everywhere, the cables, the cd, the speakers, to see if the problem moves to the channel it should, just to be certain it is the amp. If you isolate it and it is the amp, you could evan try this inside the amp to isolate the pre- and power amp sections, but this might be more trouble than its worth. (If it is a passive, you could easily locate a bad control this way).
I offer this because there have been occations where I was sure it was a certain component and it turned out to be a cable, and usually when I ask someone like a tech, they ask if I had isolated it.
I offer this because there have been occations where I was sure it was a certain component and it turned out to be a cable, and usually when I ask someone like a tech, they ask if I had isolated it.
