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Fender TBX Tone Control Mod

Discussion in 'Pickups & Electronics [BG]' started by acebase62, Jul 13, 2017.

  1. acebase62


    Jun 29, 2010
    The Fender TBX tone control came stock in the passive Fender Jazz Bass (PJ) I bought new in 1985. I have since assembled a few passive JJ and PJ Warmoth basses, and have always used Fender TBX tone controls and 500k volume pots, the same as the stock Fender.

    The TBX tone control is a stacked tone pot which allows some extra tone variety past the detent position. The only con I found with the units is they usually come wired with a .022 capacitor. With my basses, this seemed to result in a quicker jump to clarity with more highs available than I would normally need, especially past the detent position. Overall, I still preferred the TBX to standard passive tone pots.

    I recently began swapping out the .022 capacitor on the TBX for .047 value, and prefer the tone sweep and sounds. I seem to notice a little more growl as well, but this is subjective for some.

    I just wanted to share my positive experience with the TBX mods and 500k volume pots, and some might find a similar set up an inexpensive enhancement to their bass.

    Nebula24 and Crater like this.
  2. Usidore T Blue

    Usidore T Blue

    Jun 28, 2017
    Useful, thanks!
  3. Cool. An '86 fender came in yesterday for a setup. I might play around with the tbx while I have it on the bench...
  4. JarodGrieco

    JarodGrieco Supporting Member

    Mar 8, 2012
    I'm going to put a TBX in my Mexican jazz. I'm wondering, aesthetically, is it possible to get my normal jazz tone knob onto the tbx unit? I won't do this if it means I'm married to that strat knob with the numbers on it
  5. Brewsbrother


    Jul 1, 2019
    Just came across this post. I've installed a tbx in a pj bass that I built and get almost no change in the bass cut direction (i.e., 10), but a deep bass tone in the treble cut direction (0). I'm wondering whether switching to a 500k volume pot would make the difference. I've got one 250k volume pot and a 250k blend pot.
  6. I'd never thought of putting a TBX pot in place of the standard tone pot. Great idea, at least to test. I think I have one or two TBX pots and a couple extra .047 resistors in my parts box. I used to have them in Strats. I've forgotten how to wire them. Hmmm.... I'll have to got spilunking in my parts box to see what I can come up with.
  7. Brewsbrother


    Jul 1, 2019
    I used a Vitamin Q 0.067 cap on mine. It's the value I found on a '93 JP bass I worked on several years ago. It might be a little too dark and muddy, but I wonder if that will change if I swap the 350k volume pot for a 500k.
  8. I still need a wiring digram to substitute it for a regular tone pot in a J bass. Help, please.
  9. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

    Apr 14, 2021

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