MarshallDog
Well-Known Member
But if you unplug everything, and the hum goes away, how can that be the amp?
I would be looking at the guitar, the cables, and any FX you might be using first...
Have you tried a different guitar? Different cable?
My Jubilee did the same thing when switched to channel 2 only. At a low volume it was fine but simply turn up the volume with a guitar plugged in OR nothing plugged in and it would start going into a strange hum. Changed V1 and its all better. Must have something to do with noise and the tube going microphonic or something Its worth a try.