Turning a rhythm circuit into PBT controls?

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Ceylon
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Turning a rhythm circuit into PBT controls?

Post by Ceylon » Sun Sep 30, 2018 1:49 am

Did anyone ever convert their rhythm circuit into a sort of two-band PBT thing? I was reading these two articles by Joe Gore where he more or less walks the reader through how you'd modify two regular tone pots into working like the passive bass-treble dials on G&L guitars.

https://www.premierguitar.com/articles/ ... ods?page=1

http://www.seymourduncan.com/tonefiend/ ... p-awesome/

This seems like it would open up a lot of tonal opportunities on, say, a Johnny Marr Jaguar where you're switching between series/parallel, and just in general be pretty useful for sculpting your tone to suit fuzzes and such on the fly. I could also see it possibly replacing both the strangle switch (which mostly just cuts bass frequencies anyway, right?) and the rhythm circuit (which cuts treble) while being applicable to both pickups. If so, that's also leave a standard Jaguar with two free switches that might be used to something like in series/out of phase switching. In addition, with both the treble and bass rollers all the way down you'd have this very middy tone that may or may not be actually useful.

Has anyone done it, or tried to do it, or can you immediately think of some reason why it couldn't or shouldn't be done? I do suck at soldering, but I'm still itching to get some G&L MFDs for my Jaguar and then just seeing how much I could open it up tonally with some wiring mods.
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Shadoweclipse13
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Re: Turning a rhythm circuit into PBT controls?

Post by Shadoweclipse13 » Tue Oct 02, 2018 12:06 am

I can't remember specifically, but I've seen a couple people around here do it on both Jaguars and JM's. I think I might even have a schematic for one up on my schematic page, but I can't remember for sure. Personally, I really enjoy the sound of the rhythm circuit, but I could see also enjoying that function quite a bit as well.

What would be cool would be to use the switch in the rhythm circuit area to select the bridge or neck pickup to use the PTB controls, so the main volume and tone would work for the whole guitar output, but the PTB would be for only one pickup at a time.
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BarnyardCoral
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Re: Turning a rhythm circuit into PBT controls?

Post by BarnyardCoral » Wed Oct 03, 2018 5:32 pm

Upgrading Jazzmaster Electronics Part II: Wiring Mods https://reverb.com/news/upgrading-jazzm ... iring-mods
This has PDF schematics. Hope this helps.
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SY6655321
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Re: Turning a rhythm circuit into PBT controls?

Post by SY6655321 » Tue Oct 09, 2018 9:13 pm

I tried to PTB... using regular pots (non-reverse. 1M, 500K, 250K for the bass cut) but the taper was always shit. Try to find that 1M reverse potentiometer, then let me know where you bought it ;D

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