Proposition distortion

Roberman

Member
I'm at a loss for ideas on how to troubleshoot this one. Signal passes perfectly in bypass, but when engaged (with a j201 or jumpered) I have less than half the output I should. What I CAN hear sounds great, but that's as much as I got so far. The red clipping LED's light up when I play but the green does not (is it supposed to?) so I'm supposing the issue is downstream from the clipping circuit.

I've double checked every resistor and cap, and the pots measure the correct resistances as well. I've tried swapping each of the TL072's and tried a few different charge pumps. If I hold some hookup wire in my hand and touch it to either R22 or R23 the output spikes dramatically but without a schematic I'm kinda stuck. Anybody got any obvious suggestions I may have missed?

B706F5C5-DF20-4C0C-853D-C71D23318D22.jpeg
 
Did you ever get this solved? The schematic is now in the build doc on the item project page. You may need to refresh your browser to get it to load if the old one (without the schematic) is still cached.
 
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