Hi guys. I'm going over the restoration of my amp and I'm still having this same issue. It sounds like dirty when listening and it makes a huge noise when I move the volume control knob, I have to do it very slowly so I don't blow off the speakers, needles go crazy. This same thing happens when I press any of the buttons of the push switch circuit board... At first I thought that this was because of dirty pots but after a deep cleaning the same thing happens. I thought also that maybe I had an issue with the equalizer board but after rebuilding, recapping and cleaning pots the issue remains. Strange thing is that when I choose FM radio I don't get any strange noise or scratchy pots. It works great I still have to recap the dolby board and the push switch circuit board, could the problem be in this section? All the other boards have been recapped and pots cleaned. I'll upload a video with the issue. Thanks!