'73 JMP 50w Input II - guitar noise
Posted: Tue Apr 10, 2018 11:05 am
I've recently rebuilt a JMP that had previously been modded to the point of being unrecognizable. All new electrolytic caps, new ARS filter caps to take care of a pervasive hum, a few out of spec resistors, a UF5408 diode in front of the bridge rectifier, and added a PPIMV.
When using either of the main inputs, the amp performs beautifully. On the Input II side, I'm getting noise from the guitar's volume pots and pickup switch... Loud pops with the pickup selector, and static noise as I roll the volume pots back and forth.
Does this sound familiar to anyone? After a few days of searching, I haven't been able to find anything remotely similar to the problem I'm having. I'd appreciate any help I can get, thanks!
When using either of the main inputs, the amp performs beautifully. On the Input II side, I'm getting noise from the guitar's volume pots and pickup switch... Loud pops with the pickup selector, and static noise as I roll the volume pots back and forth.
Does this sound familiar to anyone? After a few days of searching, I haven't been able to find anything remotely similar to the problem I'm having. I'd appreciate any help I can get, thanks!