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BUILD NOTES

Gain stage modification

The original 1978 Big Muff used a gain setup similar to the original Big Muff: a fixed gain stage with a

volume control after it that attenuate the level before the clipping stage.

Since it uses an op-amp rather than a transistor, it's better to make the gain itself variable as opposed

to running it full-up and then cutting back the level afterward. So, the Corvus includes a modification

suggested by Analogguru that accomplishes this. C4 is added as a DC blocking capacitor, and the Sustain

control is wired back to the inverting input of the op-amp to control the gain directly.

The stock version of the Corvus uses this modified gain stage, so if you build it according to the parts

list, it will have this improvement. However, if you'd like to build the stock version, you'll want to do the

following:

• C5: jumper

• R7: omit (leave empty)

• R8: 47R

CORVUS DISTORTION / SUSTAINER