G&L PBT wiring

Discussion in 'Pickups & Electronics [BG]' started by xaxxat, Dec 24, 2012.


  1. xaxxat

    xaxxat Supporting Member

    Joined:
    Oct 31, 2008
    Anyone have any drawings/pics of G&L's Passive Bass Treble circuit?
  2. line6man

    line6man

    Joined:
    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    If you're talking about the passive bass and treble controls common to G&L basses, that's nothing more than a standard tone control, plus a capacitor in series with the signal path, with a 1M pot parallel to the capacitor.

    There is a schematic of it somewhere. I'm on my phone, so I'll have to search for it later.
  3. Stealth

    Stealth Supporting Member

    Joined:
    Feb 5, 2008
    Location:
    Zagreb, Croatia
    Here you go.

    [​IMG]
  4. xaxxat

    xaxxat Supporting Member

    Joined:
    Oct 31, 2008
    I ran across this pic. Is it not a L-1000? It looks quite different from that schematic.

    Attached Files:

  5. xaxxat

    xaxxat Supporting Member

    Joined:
    Oct 31, 2008
    This one is different too.

    Attached Files:

  6. Stealth

    Stealth Supporting Member

    Joined:
    Feb 5, 2008
    Location:
    Zagreb, Croatia
    Both schematics are, from C3 to the output, functionally the same. To change how the bass sounds when the treble control is fully open, use a 250K VR3 for a vintage one with less treble, and a 500K VR3 if you want a modern tone with more zing.

    C3 is probably there to give a bit more growl to the tone (a lower resonant frequency) even with VR3 fully open, and R1 gives it a generally brighter tone with more resonance (a higher peak). As for the SW1/C2 combination, that gives the series mode slightly less muddiness.

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