Peavey KB60 problem - possibly power supply

[Enzo]

I used to do a lot of field service, and I went to peoples' homes and repaired juke boxes among other things. I once went on a call, they swore it was just playing along fine and then quit. "No, nobody was inside it at all."

Of course inside the wires to the speakers were hanging free, other cables were disconnected, and one cable had been plugged into a tube socket, and the tube plugged into a cable socket.