Help me trouble shoot hum on new bass

Discussion in 'Pickups & Electronics [BG]' started by SBassman, Jan 12, 2014.


  1. SBassman

    SBassman Supporting Member

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    Can you help me trouble shoot hum on a bass?
    Prefer responders to be electronics knowledgeable, not guessers.

    Bass has 2V, 2T controls, with 2 humbuckers.

    Scenarios:

    1.
    v2=max t2=max
    v1=max t1=max
    -> Loud Buzzing.

    2.
    v2=max t2=min
    v1=max t1=max
    -> Super Quiet

    3.
    v2=max t2=max
    v1=max t1=min
    -> Super Quiet

    4.
    v2=50% t2=anything
    v1=50% t1=anything
    -> Low buzz

    ? Help greatly appreciated.
     
  2. pfox14

    pfox14

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    Have you tried cleaning the pots? Always helps. Is there enough shielding in the control cavity and pup routs?
     
  3. SBassman

    SBassman Supporting Member

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    Dealer: PiccoBass Guitar-scale Basses
    Thanks.

    Don't think it's a pots situation.
     
  4. icecycle66

    icecycle66

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    Arizona
    Look for grounding issues. That's usually what's wrong when this happens.

    If it's passive electronics, the problem should be easy.
    Look for a wire that's not apparently connected to anything. That's probably your ground wire. Most basses have the ground wire smashed under the bridge plate so that it's all grounded to you.

    You may also solder it to the ground side of your jack.

    Then you have to make sure all the ground wires from each pickup and pot are all connected so you don't have a break anywhere.
     
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  6. RobbieK

    RobbieK

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    What bass is it? Brand, model...
     
  7. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Gold Supporting Member

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    Does the buzz go away when you touch the strings/bridge/metal? (shielding issue) Does the noise get louder? (grounding issue) Is the noise unaffected? (something deeper)
     
  8. Lownote38

    Lownote38

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    Sounds like a ground wire came off in there.
     

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