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Thread: Jazz PJ wiring issue

  1. #1
    Woodgrinder/Pickupwinder copperheadroads's Avatar
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    Jazz PJ wiring issue

    I have a Jazzbass with the Precision bass pickup in the neck position & both pickups are wound so the P don't overpower the Jazz .& using the stock pot configuring v/v/t . but the problem I'm having is when both pickups are on full i get a drop in volume & treble & I don't think it is out of phase problems as I've reversed the wires of the jazz pickup & it still didn't correct the problem . Any one know a solution for this ? I've read one thread about "insertion loss" feel free to comment .
    "UP here in the Canada we shoot things we don't understand"

  2. #2
    Woodgrinder/Pickupwinder copperheadroads's Avatar
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    Really Nobody ? now i notice this with any jazzbass with both volumes at full you do get a slight treble roll off ..try it
    "UP here in the Canada we shoot things we don't understand"

  3. #3
    Supporting Member Steve A.'s Avatar
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    I think it has to do with the mismatch of the pickups. If you get a better sound with one pot turned down a little bit (say to 9) you can add a resistor so that the pot never goes to 10.

    I noticed a similar effect when combining a series wired HB with a parallel wired one.

    Steve A.

    P.S. If you need help determining the correct resistor to add post your readings*** here and I will do the math.

    *** I'd need all 3 readings (1-2, 2-3,1-3) with the pot set to 10 and with the pot set to whatever setting works best. (If you can temporarily disconnect the hot leads it would be more accurate.)

  4. #4
    Better Tone thru Mathematics bob p's Avatar
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    Isn't this what they call "VVT Syndrome"? Loads of threads on it over at Talkbass.
    "Stand back, I'm holding a calculator." - chinrest

    "I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck H

  5. #5
    Old Timer Leo_Gnardo's Avatar
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    Quote Originally Posted by copperheadroads View Post
    I have a Jazzbass with the Precision bass pickup in the neck position & both pickups are wound so the P don't overpower the Jazz .& using the stock pot configuring v/v/t . but the problem I'm having is when both pickups are on full i get a drop in volume & treble & I don't think it is out of phase problems as I've reversed the wires of the jazz pickup & it still didn't correct the problem . Any one know a solution for this ? I've read one thread about "insertion loss" feel free to comment .
    Had the same "problem" when I had a Jazz bass. One potential solution in the modern day, a simple FET preamp following each pickup, you could easily make yourself a copy of the old Alembic Stratoblaster for instance, then mix the pre outputs say with a couple 10K resistors.

    With the simple 2-pot mixer in the stock Jazz bass wiring, one pickup gets loaded down by the other when both are on 10 resulting in that loss of treble response. I s'pose you could sum the outputs of each volume pot with a pair of resistors, say 100K to 220K, but that would leave you with a high impedance output, an overall signal loss, and likely easier to pick up hum/buzz on the guitar cable. 3rd solution, same resistance mixer but feed that into a FET preamp within the bass. No easy way out without adding a battery.

    How's them iceburgs?

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