Fender Jazz Deluxe Push/Pull Preamp Bypass

Discussion in 'Pickups & Electronics [BG]' started by JJBluegrasser, Dec 12, 2005.

  1. JJBluegrasser

    JJBluegrasser Wannabe Snazzy Dresser

    Apr 17, 2003
    USA, Raleigh, NC
    Hi all,
    I've tried searching for this, but I was surprised to see that I couldn't find it here on Talkbass (if someone knows where it is, please let me know).

    I have a '99 Fender Jazz Deluxe with the active preamp (9V not the 18V). I'd like to install a push/pull pot to disengage the preamp and run the pickups in a standard configuration.

    Does anyone have schematics for this mod? Is it even possible?

  2. JJBluegrasser

    JJBluegrasser Wannabe Snazzy Dresser

    Apr 17, 2003
    USA, Raleigh, NC
    Thanks so much for offering to help. I saw your post on the other thread, but my configuration is different. The wiring diagram that jenderfazz linked (http://www.fender.com/support/diagr...0195400APg2.pdf) is correct for my bass as well.

    Thanks again for being willing to help!

  3. Here it is:


    According to Fender's parts list, the midrange pot, which is the only good candidate for a push/pull, is a 100k B (linear) pot. Check the usual suspects (allparts, wdmusic, guitarelectronics) but I doubt you will find one, in which case you'll have to use a mini-toggle switch that you could probably squeeze between the bass/treble and midrange controls.

    Alternatively, although it looks like the volume pot is soldered to the PCB, a 250k audio push/pull is easy to find, so maybe you could get one of those and do some rearrangement in there, like remove the PCB from the pot, re-connect it with wires and accommodate the PCB somewhere else in the cavity.

    Hope this helps,

  4. Chasarms

    Chasarms Casual Observer

    May 24, 2001
    Saint Louis, MO USA
    MY 2000 has the whole uniit, preamp, pots and all integrated into one board.
  5. B String

    B String Supporting Member

    Apr 11, 2002
    Los Angeles
    I have a 2005 american deluxe jazz. My tech put a simple
    switch in the battery compartment. No alteration of the
    stock circuitry and easy to get to.
  6. Nope, that's just a double pot as used in stereo circuits. I've looked in Mouser, Newark and Digikey and found nothing. I suspect it's got to be either the toggle or the vol. pot with PCB "relocation". I would go with the latter, it should be pretty straight forward to separate the pot and the PCB and find somewhere to fix it with double-sided sticky tape.
  7. bazzanderson


    Oct 7, 2002
    Austin, TX
    I'm interested in this as well. What's difference in tone between active flat and passive?
  8. descendent22


    Jul 29, 2015
    I have the fender p bass special active deluxe.mhas pretty much the same wiring diagram shown above with a pcb on the volume pot. I made a slight modification, I change the pickup selector pot/knob for a 3 way toggle switch. It's just what I prefer. during the process the power wire that gives the power to the pickups on the pcb came disconnected. Now the trouble and one thing holding me back is that I can't get a good connection unless I move the wire around with my finger. Almost like using an antenna back in the day on your tv, moving it around for the right spot to get the station in. ANY ADVICE AS TO HOW I CAN GET A GOOD CONNECTION?

    image.jpeg As seen in the picture where my finger is pointing, that the power wire on the pcb.
  9. Resolder it.
  10. descendent22


    Jul 29, 2015
    I did it's just not working out
  11. Did you damage the traces? If so, then they cannot be repaired.
  12. descendent22


    Jul 29, 2015
    Hmm, it doesn't look so but I was thinkin it coulda been damaged. If that's the case, is their anyway I can bypass it, or maybe remove the pot/board entirely? What are some alternatives?