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Bottom wave preamp issue?

Discussion in 'Pickups & Electronics [BG]' started by Rapisme, Jul 18, 2012.


  1. Rapisme

    Rapisme Supporting Member

    Dec 5, 2007
    RAPISME
    Hi, first time poster,

    Everything is wired correctly, according to this diagram

    http://www.sadowsky.com/media/download/wiring_diagrams/VintTone_retrofit.pdf

    I double checked all my work, but there's still an issue I'm having with this bass:

    In active mode, when the bass boost is fully engaged the master volume pot makes a nasty noise while turning volume up and down.
    If I reduce the bass boost to about 1/2 way it doesn't have that problem, also no issues in passive mode.

    Here's a detailed YouTube video I made of this, which shows the problem I'm having:



    I was wondering anyone has any ideas or suggestions why this is happening? I've tried different cables, 9V batteries, and amps.
     
  2. fsoheili

    fsoheili

    Jul 18, 2012
    Any opinions on this issue?
     
  3. SGD Lutherie

    SGD Lutherie Banned Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    You may be getting feedback between some of the wires inside the bass.

    Try moving them around and see if it helps.

    Also, you shouldn't boost your bass control all the way.
     
  4. fsoheili

    fsoheili

    Jul 18, 2012
  5. SGD Lutherie

    SGD Lutherie Banned Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    Are your pots grounded?
     
  6. fsoheili

    fsoheili

    Jul 18, 2012
    Yes. Anyway good news: Problem solved after swapping out one of the pots. Same exact wiring, but now it's working well, still unclear what was going on to begin with...but now I'm not worried about it anymore. Thanks!
     

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