First of all, hi AK. I'm new to the forum and to vintage audio in general, but I'm happy to be a part of it. I recently acquired a Yamaha CA-1010 in not bad but not perfect shape. The only obvious issue I've been having with it is a persistent scratchy / static-y distortion coming from the right channel. This happens at all volumes, through speakers or headphones, and always in the right channel regardless of whether I select mono, stereo, or stereo reverse on the mode dial. It'll occur whether or not there is an input source, although I will still receive sound through the right channel with an input source. My first thought was a dirty switch or bad contact somewhere. Doing some research on these forums I identified the mode selector switch, muting switch, coupler switch, and speaker protection relay as possible culprits. That or bad / cold solder joints. I hit all the switches and pots / VRs with contact cleaner (just CRC; Deoxit's in the mail) and disassembled and cleaned the mode dial with contact cleaner and a hi-polymer eraser, to no effect. Next I disassembled and cleaned the coupler switch and re-soldered all the connections on the coupler control board. That actually seemed to make the problem worse, with the static now being considerably louder than it was before. I haven't done anything to the relay other than bang on it with a screwdriver a couple of times. It didn't seem to do much. Anyway I'm feeling somewhat defeated at this point, so I thought it was time to try my luck on these forums. Does anybody here more experienced than I am have any ideas about what could be causing this distortion?