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Stacked pots modification

Discussion in 'Pickups & Electronics [BG]' started by remiiiiiii, Aug 21, 2012.

  1. remiiiiiii


    Jun 30, 2009
    Hello everyone :)

    I have these 2 stacked pots on my bass (low and high filters, ACG preamp)


    I would like to replace them by a single pot, for each. 2 regular pots instead of 2 stacked pots.

    Each of these single pots will have to control the lower ring. That's the only thing I want to control.
    I would like to have the top pot for each stacked pot allways max Clockwise (I managed to do that I think, using my multimeter, see yellow wiring in the next picture) by bypassing them directly into the electronic cavity of my bass (just a basic soldered contact in fact).

    So for the 4 connectors one, I think I got it.

    But for the 6 connectors one ... I'm totally lost :crying:


    Can anyone help me on this ? :)

    Thanks !
  2. remiiiiiii


    Jun 30, 2009
    ok, I don't know if anyone cares but I think I got it.

    Using my brain (lol) and my multimeter I think this is the solution :

    This is what I mesured :


    This is what I'm gonna try, I think it's correct :


    If anyone see a big mistake, please tell me :bag:

    thanks !
  3. LukeFRC


    Mar 15, 2012
    can't see a reason why that wouldn't work.... but why are you doing it?

    you could add a switch a-la alembic to have a turn the resonance up/down
  4. NelsonNelson


    Sep 25, 2011
    I agree...not trying to be rude but what is the reason behind this? Stacked pots work as good as single ones...unless you like the look of a ton of knobs. I have an older Carvin that has 5 knobs and I think it just looks a little busy.
  5. remiiiiiii


    Jun 30, 2009
    3 reasons :

    - The look, it's going on my wal bass replica, and I find it perfect like it is regarding the knobs : http://goo.gl/VWjcK
    - I don't use the top knob for the moment, It just stays at the same position all the time
    - I like to tinker :)

    edit : I might leave trimpots or regular pots into the electronic cavity to replace the missing "top pot", just in case. Not sure about that though.
  6. John East

    John East Commercial User

    Jan 10, 2002
    Oxford UK
    Owner of E-Pro & East UK
    Yesterday Alan at ACG asked me to make a diagram of the pot connections for you, but I didn't get a chance yet, but I will before this week is out.

    The frequency pots are C100K DUAL pots (reverse log) BTW.
  7. remiiiiiii


    Jun 30, 2009
    :eek: John East !

    Alan told me he'd ask you ;)
    thanks a lot for taking the time to help me.

    Best regards,


    edit : I found these pots : http://www.banzaimusic.com/Alpha-24mm-STE-100k-REV-log.html I'm guessing it will work ? I can't find ALPS stereo pots on the web.
    May I also ask you the value of the volume pot ? I measured 4,5K ohm, but it's a weird value, kinda. (I unplugged it from the PCB before) nevermind, It's written on it : A5K. So it's a 5K ohm (pretty uncommon !) and log.
  8. John East

    John East Commercial User

    Jan 10, 2002
    Oxford UK
    Owner of E-Pro & East UK
    Sorry for delay, had a lot to get through!

    I (only just) sent a modified diagram, the one you made last (which is pretty much bang-on BTW), marked up a little with more info. Since it's Alan's product, he will decide what info he issues about it.

    Since already published by yourself, the wiring in your diagram should work, and you can use the same dual 100K rev log type for the HF frequency.

    The banzai 100K dual rev log pot should be fine, looks quite large!

    If you bought the C100K reverse log duals, with pull switch, from MEC, you could switch your filter peak on and off like the WAL. (WAL use MEC pots)

    You can use 10K log for the volume instead of 5K.
  9. remiiiiiii


    Jun 30, 2009
    Hi John,

    no worries about the delay, really !

    thanks for all these information, very usefull :)
    I received the diagram from Alan.

    I might consider the pushpull option in a near future, good idea !

    Thanks for everything, this is what I call great support :D


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