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Peavey Foundation S / complete rewire

Discussion in 'Pickups & Electronics [BG]' started by Uncle Freddy, Jan 2, 2014.


  1. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
    hello everyone, going thru a Peavey Foundation S (passive) bass on my bench at the moment …..see attached photo …..this is a 2 volume / 1 tone set-up but I'm confused as to the use / placement of the caps & resistors ….the soldering & level of detail by whoever did this wiring is a solid 3 on the 10 scale, as cold solders and frayed wires were present ….as I do not have immense bass wiring knowledge, can someone please explain the configuration of the caps / resistors ??….all 3 are different but read to be .02 in value ?? …..or .02 for the ones on the volume pots and ?? for the one on the tone pot ?? any help in identifying what is going on here and what is or is not stock as per factory wiring would be very helpful (I want to replace everything) …..I am just confused on the caps & resistors, so I am just showing a pic of those with the old pots …..thanks for the assist guys …..[​IMG] [​IMG]
     
  2. Major Softie

    Major Softie

    Joined:
    Sep 23, 2011
    Location:
    South Lake Tahoe, CA
    There is no attached photo.

    Edit: nvm, there is now.
     
  3. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
    there is now ….my apologies
     
  4. Major Softie

    Major Softie

    Joined:
    Sep 23, 2011
    Location:
    South Lake Tahoe, CA
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  6. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    Those capacitors are supposed to be treble bleeds. They make it so you don't lose high end when you roll off the volume for the pickups.

    Looks to me like someone replaced a pot and soldered a new capacitor (the green one). Unfortunately, it's soldered in as if it would be a tone control. It might be the wrong value for a treble bleed, as well.

    PDF Schematic from the other thread. C4 and C3 are the treble bleeds.

    EDIT: on closer inspection, it looks like the green capacitor is doing absolutely nothing.
     
  7. Major Softie

    Major Softie

    Joined:
    Sep 23, 2011
    Location:
    South Lake Tahoe, CA
    Yeah, it's hard to tell if it goes from the back to the contact on the pot, or from the back to . . . the back.
     
  8. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    Doesn't matter if it goes back to that lug or not. That lug soldered to the case. Both sides of the cap are going to ground.
     
  9. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
    Stone Soup is correct, that green cap on far left goes from case to case(or back to back), and correct: case is ground so both sides of that cap are going to ground ….which means it does nothing - correct ?? ……also, the value of the cap on the tone pot has me confused ?? what is it ?? what is it supposed to be ?? …….it reads .02Z ….??? …….
     
  10. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    The value of the treble bleed cap should be .001 microfarad (uF). It should be wired between the other two lugs on the pot.

    It doesn't have to be there. Many basses don't have them. Peavey put it there because they thought the bass sounded better with it in place--when the volume was rolled off.



    EDIT (again): I'll assume the .02Z means .022 uF. That is the proper value for a tone control; not for a treble bleed. Radio shack probably has .001 uF caps for very little cost.
     
  11. Major Softie

    Major Softie

    Joined:
    Sep 23, 2011
    Location:
    South Lake Tahoe, CA
    Are you old enough to remember what Arte Johnson would have to say about this? :eyebrow:
     
  12. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
    got that, thanks Stone Soup ….but the treble bleed caps are on the volume pots ….I'm now trying to figure out what the actual TREBLE POT cap value needs to be ?? ….one would think it should be a .047 but who knows what Peavey decided to do when they built these basses ….I will post a close up shot of the treble pot cap as soon as my camera battery cops a quick charge …..
     
  13. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    I think I was four when Laugh In was canceled, so I'm sketchy.

    I'll guess: Verrrrrry innnnnnteresting....
     
  14. Uncle Freddy

    Uncle Freddy

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    Jan 2, 2014
    yes, "very interesting, BUT STUPID" ……!! (I'm 51) ….
     
  15. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    I'll say it's a .02 microfarad capacitor. It's a common value in basses and guitars. You can try different values. No harm in trying.
     
  16. mech

    mech

    Joined:
    Jun 20, 2008
    Location:
    USA
    Yep.

    mech
     
  17. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
  18. Stone Soup

    Stone Soup

    Joined:
    Dec 3, 2012
    If the bass sounds okay, leave it.

    Is there an issue with the sound of this bass?
     
  19. ReidK

    ReidK Jst sy n t lssy cmprsn. Supporting Member

    Joined:
    Jan 2, 2007
    Location:
    Winnetka (L.A. area), CA, USA
    It means .02 uF. The letter indicates the tolerance, and Z is the loosest, +80%, -20%. That means the actual cap value (when new) could be anywhere from .016 to .036 uF.

    Reid
     
  20. Stone Soup

    Stone Soup

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    Dec 3, 2012
    great info. :) I never studied electronics. I've just tinkered with guitars for a long time.
     
  21. Uncle Freddy

    Uncle Freddy

    Joined:
    Jan 2, 2014
    OK GUYS, all of you .....oddness here that needs to be explained, in the pdf of the Foundation schematic that Major Softie and Stone Soup directed me too (links in our discussion thread) .....the RIGHT HAND bass diagram shows the two .02 treble bleed caps on both the volume pots as you would think they should be installed .....BUT !! on the LEFT HAND bass diagram directly below the RIGHT HAND bass diagram, it shows the treble bleed cap wired in for the neck volume as it was on my "right hand" bass, which is per the photo I posted: ground to ground or base to base for both contacts of the cap ????? ....so, my question now is: why would the treble bleed caps be soldered in differently for the RIGHT HAND bass and the LEFT HAND bass ?? ....and doesn't a cap being wired directly into the ground path mean the cap is doing nothing ?? .......thanks guys .....
     

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