Author Topic: Guv'nor GV-2 Deep Circuit Frequency Change  (Read 186 times)

Axldeziak

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Guv'nor GV-2 Deep Circuit Frequency Change
« on: August 30, 2019, 06:46:36 PM »
A few months ago I copied the Marshall Guv'nor GV-2 Deep Circuit on a vero and installed it into an GV1 clone I built. (It rocks!) I've since been wondering about how to change the frequency of this circuit so I could switch between settings.

According to this posting here:
http://www.marshallforum.com/threads/marshall-gv2-guvnor-plus-overdrive-distortion-pedal-how-it-works-mods.93225/
"The Deep control is focussed on very low bass, below guitar range. The hump could be shifted up by decreasing two caps (C16 and C17) in the deep circuit to give more action around 80hz."

What I'd like to know is just what values are needed for C16 and C17 to raise the frequency from the listed 30hz to the suggested 80hz? And how is that determined for this circuit with the two caps in parallel with each other?

Here's the GV2 schematic and my layout: