Strange volume pot behavior: VVT with a neck J and bridge MM soapbar

Discussion in 'Pickups & Electronics [BG]' started by mindgames11, May 10, 2020.

Tags:
  1. mindgames11

    mindgames11

    Feb 18, 2020
    I bought a cheap Rouge 5 string J bass with the intention of messing around and installing a variety of pickups in it.
    I installed an Artec MMC5 neck pickup in the bridge position (that's where the string spacing lined up, plus I thought I might get a bassier sound using a neck pup) and the neck pup from an ebay $20 (for the neck+bridge) set. Resistance of the J pup is 6.8K. Don't know the resistance of the Soapbar.
    I've got it wired Vol-Vol-Tone with 250K pots.

    The behavior is this:
    When I use the pots one at a time (one pot turned all the way down), the behavior is normal.
    When I try to combine the two volume pots it gets weird. If pot A is all the way up, bringing pot B up does nothing until above 75% then the output drastically lowers.
    Lowering pot A below 75% then drastically increases the output of pot/pickup B. In effect, I can only use one pickup at a time.
    I can't seem to get any combination of the pickups.
    Can anyone provide any insight here?
     
  2. ctmullins

    ctmullins Dominated Gold Supporting Member

    Apr 18, 2008
    MS Gulf Coast
    I'm highly opinionated and extremely self-assured
    Sounds like they might be out of phase. Try swapping the hot and ground leads of one of them.

    (“Rouge” means red...)
     
  3. mindgames11

    mindgames11

    Feb 18, 2020
    Ah yea, I meant the word akin to brigands, not ladies facepowder.
    swapping the leads coming from the pickup, or swapping the leg connections on one of the pots?
    attached is a quick sketch of the wiring set-up.
     

    Attached Files:

    ctmullins likes this.
  4. JKos

    JKos

    Oct 26, 2010
    Surprise, AZ
    Yes. Swap the leads form ONE of the pickups.

    - John
     
  5. ctmullins

    ctmullins Dominated Gold Supporting Member

    Apr 18, 2008
    MS Gulf Coast
    I'm highly opinionated and extremely self-assured
    It looks like it would be easiest to swap the leads coming from the Jazz pickup.

    I'm not sure why you have white and green and shield (3 wires) going to ground on the double coil??
     
  6. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    The humbucker is wired in parallel.
     
  7. ctmullins

    ctmullins Dominated Gold Supporting Member

    Apr 18, 2008
    MS Gulf Coast
    I'm highly opinionated and extremely self-assured
    Ah, I see it now; "R+Black" must mean "Red and Black". :thumbsup: