Good to hear that the 20pf cap showed up!
To respond to your diode orientation question:
The diodes are both installed backwards. Unfortunately, some of these old Russian NOS germanium diodes are apparently marked in the opposite direction, with the stripe or dot at the anode end rather than the cathode. This doesn't matter when they are installed as opposing pairs for signal clipping, but in this application, it is critical. The only way to be sure is to closely examine them under magnification. There will be what looks to be a silver block at the cathode end, and that's which lead should go in the square solder pad of the PCB. Here's a diagram:
Here's a blow-up of the diodes in your photo with that silver block at the cathode end marked:
Attachment:
ge_diode_cathodes.jpg [ 110.7 KiB | Viewed 6132 times ]
You should correct this situation and see how the pedal sounds at that point, then repost any questions that you still have.
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