Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: steveo7868 on July 03, 2021, 07:58:30 am
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I have a weird idea to add a knob to the typical vox ac30 top boost tone stack, because I have a chassis
that has a faceplate for a mid knob, and I dont really want to change the tonestack that much
to make it a true TMB, what effect would there be if that extra 10k resistor from the wiper of the bass pot
was made into a 10k pot? I did try this on the bench and it seemed to do something... possibly affecting the mids..
to be honest I would rather build it stock without this knob but, I just wondered about this idea..
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Your answer, and a world of experimenting possibilities, lies here:
https://www.guitarscience.net/tsc/vox.htm#
You’re asking about changing the value of R2 in this scheme.
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I’d use it for a switch to alter the coupling cap value from the input stage’s anode. That will bring in more mids, so it’s appropriate!
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Awesome answer and sure enough it is a mid pot and all the way up its stock, or if you want more mids it looks like a 25k pot would be the ticket