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Issue: Strumming lightly has no output. Strumming hard only produces high-mid heavy fuzz-like tone with no sustain and no discernible difference in volume. The note sounds for a short time, then just cuts.
Volume control works, gain/tone/switch don't appear to have any effect on output. Works fine in bypass. I triple checked wiring, photo overlays of the layout both front and back.
I swapped the JRC4580D ICs as a hopeful quick fix but the problem persists.
Is this likely a problem with the diodes?
I tested every diode and matched the relevant ones before placing on the board, but I guess those 1N34As or even an LED could have blown somehow. There's no LED light-up from the board when on and playing. I also tested every cap and stuck to +-1% tolerance for almost every one.
Any ideas?
I'll post IC voltages shortly.
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