I know this is a stretch but I figured I’d ask. I promised a friend I would have a look at an amp for him but beyond the obvious, I’m not too sure what to do from here. At first, it sounded like the problem was a simple dirty volume pot but after cleaning it (and trying a replacement) all I get now is a low level signal coming from the speaker and the volume pot has no effect. One of the tone pots has an effect and the other two do nothing. It is an old Traynor Bloc80B. I was wondering if anyone could suggest a course of action from here, maybe where to start metering or any ideas. I can tell him it’s toast and he’s okay with that, but since there is some sound coming out of it, I don’t think it’s entirely dead.