Tone Control for an old Garnet Amp

[frets]

Hi guys,

I found this on the internet a long time ago (can’t remember where🙀). All I know is it’s a tone control (push/pull) for an old Garnet amp. I just have the diagram and was wondering if you guys could take a guess on what the values of the cap and resistors would be. I want to build it for a little amp project I have going on. Any clues?

As always, thanks😺

[Yogi B]

Sept 25, 2022 19:18:14 GMT -5 frets said:

All I know is it’s a tone control (push/pull) for an old Garnet amp.

Seemingly you, or whomever originally copied it, looked in the wrong direction for the name of the amp — the image is from here and is actually from Stephen Delft's Moonlight Amp. (Also note that the pot terminal numbering used on these diagrams is reversed from what we typically use around here.)

On AX84's Moonlight page there are schematics of what appear to be more recent correct versions, I say this because the the switch to a linear pot gives a better overall sweep, with the flat response at (almost) 50%.

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I might experiment making this closer to a (treble-side) 'half-Baxandall': replace R1 with a jumper, remove R3 (thereby relying on the 1Meg resistance of the volume pot), use 1Meg for R2, and 180pF for C1. This should give roughly comparable results to the circuit presented in Version 2.9, but with less insertion loss.

[frets]

Thanks Yogi😸

I will proceed with the changes. I really appreciate you finding the updated schematic for it.