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Humming tone Pot on 1995 MIJ P-Bass

Discussion in 'Pickups & Electronics [BG]' started by FunkHead, Aug 11, 2017.


  1. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    Any guesses what would cause a tone pot to hum?

    Important facts to help describe problem:

    1: Hums worst in middle positions and almost disappears when maxed in either direction.

    2: Hums worse when touching strings

    3: Tone pot has little or no affect on tone.

    4: Any idea what color this is? (California Blue?)[​IMG]
     
    Last edited: Aug 13, 2017
  2. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    Anyone got anything on this?
     
  3. Killed_by_Death

    Killed_by_Death Snaggletooth

    Jan 2, 2015
    heart of darkness
    I'm just guessing, but it sounds like a faulty potentiometer.
     
    Aqualung60 likes this.
  4. ahadl2500

    ahadl2500

    Nov 28, 2003
    Greenwood, IN
    With little to no effect on tone, sounds like the pot is not running to ground the way it is supposed to when you turn it. Either a bad ground connection or bad pot. You can open it up and look, but I would probably just replace the tone cap and pot while you are in there.
     
  5. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    Found out the color is Maui Blue(International color). Pretty rare.
     
  6. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    I took it apart and Found the wiring to be all screwed up. It's got to be all un-soldered and rewired. I will try to post pics. Then need help with easiest way to fix it.
     
  7. Killed_by_Death

    Killed_by_Death Snaggletooth

    Jan 2, 2015
    heart of darkness
    While I had it open, I'd change the pots out, Linear taper 500k Ohm for volume & a 500k Ohm Audio taper for the treble cut.
    The capacitor in there is probably a 47 nF and reusable.

    I'm also assuming those pots in there now are both 250k Audio taper.
     
  8. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    The pots are indeed 250k. I have another properly pre-wired set that I am thinking of putting in. These MIJ Squiers sound great even with the screwed up wiring.
     
  9. copacetic

    copacetic

    May 23, 2007
    What year is your MIJ Squier?
     
  10. steelbed45

    steelbed45 TRemington Supporting Member

    Feb 23, 2011
    Nolanville, TX
    That's great that you have the wired set to drop in.

    I had a pot that wouldn't get straight in my MIJ P, so out of part laziness and part curiousity, I dropped a Richter passive pre in. Simple and excellent.

    [​IMG]
     
  11. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    It is a 1995.
     
  12. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    Stewartsville, NJ
    Now that's very cool! I got out the old Soldering Iron and I have an old school kit that I decided to put in. I'll just keep the pre-wired one as a back up.
     
    steelbed45 likes this.
  13. JGbassman

    JGbassman

    May 31, 2011
    Iowa
    Glad to see you got it working. P bass wiring is about as easy and simple as it gets. Sounds like you know your way around a soldering iron so everything hopefully turned out well.
     
    FunkHead likes this.