Current Issue is that clean channel tone pots R10, R11 and R12 all feed completely to ground when set to 1. As they are raised the volume goes up, but so does some noise (more noise on the high, medium noise on the mid and lower for the low. If any of those three pots are raised a slight amount past 1, the signal comes in. I have studied the schematic and am having trouble figuring out where the problem is.
Some background: a few years ago my overdrive channel pot was not reliable (sound was very low. If I moved the volume back and forth it would work, but not while staying still. Last year I cleaned all the pots and the overdrive started working again, but the clean channel began to have some distortion.
Last week I started trying to find the issue. Opened up the amp and checked for bad solder joints. I re-flowed anything that looked a bit suspect. Afterward, I had no sound from clean channel at all. Reflowed some more joints and got to the issue I’m currently experiencing.
I have confirmed the FX Return works, Footswitch also works. I’m pretty sure the issue is in the tone circuit, but would appreciate any direction from experienced guys. Attached is the schematic.
Some background: a few years ago my overdrive channel pot was not reliable (sound was very low. If I moved the volume back and forth it would work, but not while staying still. Last year I cleaned all the pots and the overdrive started working again, but the clean channel began to have some distortion.
Last week I started trying to find the issue. Opened up the amp and checked for bad solder joints. I re-flowed anything that looked a bit suspect. Afterward, I had no sound from clean channel at all. Reflowed some more joints and got to the issue I’m currently experiencing.
I have confirmed the FX Return works, Footswitch also works. I’m pretty sure the issue is in the tone circuit, but would appreciate any direction from experienced guys. Attached is the schematic.