I've got a jcm900 4500 dual reverb and when on channel b (distorted) everything works fine but when I switch to channel a it seems to pick up gain from channel b. It's intermittent (more apparent when I touch the channel a gain knob) but really annoying.
I recently put new valves in it to cure a fading in and out problem. I wondered if it had anything to do with them so I put all the old valves back in. Now the original fading problem has gone (like the valves fixed themselves :confused: ) but the channel crossing thing is still there. Even taking the footswitch out hasnt helped.
Any ideas? I've got no money to take this in so any help really would be appreciated :(