I have a Sansui R-70 receiver with one of those volume controls that has both right and left controls on the same knob, like this:
Half the time, the right channel doesn't work, and I have to tap/jiggle the knob to get it to work, and sometimes, that doesn't even do it. The thing on the inside looks like this, although this is a pic from the net, because I don't have a camera:
Does anyone know of a way to fix/clean this?