Jazz PJ wiring issue

[copperheadroads]

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 .

[copperheadroads]

Really Nobody ? now i notice this with any jazzbass with both volumes at full you do get a slight treble roll off ..try it

[Steve A.]

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.)

[bob p]

Isn't this what they call "VVT Syndrome"? Loads of threads on it over at Talkbass.

[Leo_Gnardo]

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?