Right, I replaced the preamp tubes and it didnt solve the problem. BUT... I was messing around with the volume knobs and it appears there is some cross over between channels. When Channel A is selected and volume is on 0, there is still sound produced except when the Channel B volume knob is set to 0 as well. When channel A is selected and the volume knob for channel B is set to max, channel A works as normal.
I tried channel switching with a footswitch and the problem still occurs. Therefore it must be something to do with the channel switching on the circuit board. I read somewhere that IC8 on the circuit board can go bad - anyone had any experience with that? It is some sort of op-amp.
Any help is greatly appreciated!
