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Thanks, that's really helpful. I hadn't really twigged the RC circuit going on at the input. Will have a play with the values and see what happens!

Sorry for resurrecting such an old thread - thinking of giving this one a go, but just wanted to confirm the values please because the picture doesn't come out great on my laptop. Thanks all!

R1 - 47K ??
R2 - 2M2
R3 - 4.7K ??
R4 - 680
R5 - jumped
C1 - 47nF
C2 - 33nF
C3 - 47uF
C4 - 47uF
D1 - 1N4148
D2 - any Ge ??

Those values look correct, except for R1, which appears to be labeled 4.7k. You can probably get away without that resistor if you wire the switch so that the input is grounded in bypass. If you do opt to use a pull-down resistor, you a larger value like 1M is a more common choice. 4.7k is very low and will cause high-end loss.

Thanks, that's good advice! 1M isn't surprising given that all variations of the electra PCB that photo above is based on all also use 1M. I might order a couple of different values and see what effect it has though - am I right in thinking R1 is what determines your input impedance? I wonder if perhaps R1 is deliberately low on this circuit to more closely match the pickup impedance? (More like classic fuzz than a distortion?)

Sorry for resurrecting such an old thread - thinking of giving this one a go, but just wanted to confirm the values please because the picture doesn't come out great on my laptop. Thanks all!

R1 - 47K ??
R2 - 2M2
R3 - 4.7K ??
R4 - 680
R5 - jumped
C1 - 47nF
C2 - 33nF
C3 - 47uF
C4 - 47uF
D1 - 1N4148
D2 - any Ge ??