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Pot values.....250k, 500k, 50k...what's the difference?

Discussion in 'Pickups & Electronics [BG]' started by Philthy, Dec 1, 2003.

  1. Philthy

    Philthy Supporting Member

    Jun 12, 2001
    Flanders, NJ
    I'm going to install an active 2 band preamp in a Jazz bass. However, the preamp that I have has separate bass and treble. I'd like to install a stacked bass and treble to conserve space and keep the input jack on the control plate. I'm looking online at various part suppliers (www.stewmac.com, www.basspartsresource, www.warmoth.com) and they have 250k, 500k and 250/500k dual concentric pots. Is there a correct one to use or does it not matter? What is the difference? The present pots that are on the preamp, I believe, say B30K. The preamp that I have is pretty much a no name preamp that I scored off ebay for dirt cheap but it sounded pretty good in another bass that I had. It looks similar to a bartolini HR-4.5.

    Any help or advice? Thanks!!!!
  2. David Wilson

    David Wilson Administrator Staff Member Administrator Supporting Member

    Oct 14, 2002
    Lower Westchester, NY
    From what you say, it sounds like the original pot is 30K. You should be trying to match your new pots to that, but getting stacked concentric knobs can be problematic...

    Don't use the stacked 250k/500k pots you're seeing. Apart from the impedance mismatch, they're audio taper rather than linear taper. Audio taper is for volume pots, linear is generally used for tone pots.

    Bartolini sell a stacked 50k/50k pot (DC50kBcd) for bass/treble controls.

    Aguilar also sell a stacked 50k/50k pot for use with their OBP-3 preamp.
    Aguilar now have an online store at http://www.aguilaramp.com where you can order that.