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This is a Marshall pedal that giving troublesome oscillation. Everything is packed in close. If I sample the tone at the last V1 B+ node going to the 100K I hear a high pitched note but not 12k or more. It's neat to hear the hum and noise diminish away from the B+ dropping resistors/cap network. I just tap into the circuit and listen via a 800v cap into computer speakers.
An EH toroid transformer is tucked on the other side under the pedal hood. Even I change in a 12au7 tube it remains. The clean channel works perfect. I know about lead dress and grid resistors and that is fairly decent. Moving wires around, nets no change. I changed the guitar cord too.
It is so close to being the most kickass Dunlop volume pedal around. Pete Cornish'ish tube buffer or Modded Marshall 800 —well if I ever figure this out. I may just remove a gain stage and go Plexi instead...
An EH toroid transformer is tucked on the other side under the pedal hood. Even I change in a 12au7 tube it remains. The clean channel works perfect. I know about lead dress and grid resistors and that is fairly decent. Moving wires around, nets no change. I changed the guitar cord too.
It is so close to being the most kickass Dunlop volume pedal around. Pete Cornish'ish tube buffer or Modded Marshall 800 —well if I ever figure this out. I may just remove a gain stage and go Plexi instead...
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