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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.

    Crater likes this.
  2. Usidore T Blue

    Usidore T Blue

    Jun 28, 2017
    Useful, thanks!
  3. RobbieK


    Jun 14, 2003
    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


    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

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