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Pots: 250k vs 500k??

Discussion in 'Pickups & Electronics [BG]' started by m3llo, Jul 12, 2005.

  1. m3llo


    Jan 11, 2005
    I am about to do some rewiring to my bass. It currently has the standard factory 500k pots, but the advice I got included to replace that with 250k pots (which is much bigger in size, btw).

    What is the difference between them? How does that effect the tone?
  2. ted13


    Mar 12, 2004
    montreal quebec
    larger pot may or may not fit but size really make no difference i have had more loose shaft large cts pots than the mini pots. the lower value of the pot with give you more resistance and darken the sound of your bass a bit. typically bright pickups ie:single coils, strat tele jbass pbass use 250K and humbuckers like gibsons and others use 500K.
  3. m3llo


    Jan 11, 2005
    thanks, that helps alot. i know it's off the subject, but do you know anything about tone caps? The one currently installed reads: IO4J 2A0SG. And i got the .47mfd to replace it with... Know anything about that, or the difference in tone?
  4. 104= .1mfd
    .47mfd will be a little less dark
  5. Geoff St. Germaine

    Geoff St. Germaine Commercial User

    For the pots, the higher resistance valued pots attenuate less high frequency signal. The larger the capacitor value on the tone control, the lower the high frequency cutoff.
  6. bassontherun


    Jul 9, 2005
    I'm working on a similar project (converting an Ibanez GSR 190 to DiMarzios and 250K mini-pots). Found the mini-pots at AllParts here in Houston.


    P/N: EP-0185-000 $2 each!
  7. duckbutter


    Mar 30, 2005
    can you use a 25k pot for a MM pup ? Will it "darklen" the sound at all, the one in my MTD is very bright.
  8. DavidRavenMoon

    DavidRavenMoon Banned

    Oct 20, 2004
    No, you can't use a 25K pot on a high impedance PU. You would get very little volume, if any. If the bass uses 500K, try 250K. Or better yet, just back the tone control off a bit.
  9. DavidRavenMoon

    DavidRavenMoon Banned

    Oct 20, 2004
    It all depends on the impedance/DC resistance of the PU. Typically the higher ("hotter") the PU, the higher the value of the pot. So traditionally Fender single coils, which are about 6 to 8K would use 250K, while hotter humbucking PUs used 500K.

    However, many bass pickups are wound much hotter than some guitar pickups, such as the Fender Jazz (about 12k), but still use 250k. This might be because Fender already uses 250k, so they buy them in bulk, or because they wanted to take some high end off.

    Likewise replacing a 500K pot with a 1M will give you more output and a brighter sound.

    So unless you want a darker sound, stick with the 500k pots. You didn't say if you were replacing the PUs?
    PawleeP likes this.
  10. duckbutter


    Mar 30, 2005
    thanks..btw the 25K was a typo :)
  11. m3llo


    Jan 11, 2005
    sorry for asking a dumb question, but what is PU? I'm kinda new with this stuff...
  12. David Wilson

    David Wilson Administrator Staff Member Administrator Supporting Member

    Oct 14, 2002
    Lower Westchester, NY
  13. Serek_Basses

    Serek_Basses Supporting Member

    Mar 26, 2009
    Chicago, IL
    If using a gibson style mudbucker, will just a 500k vol pot give you a brighter tone, or should I replace the tone pot as well. I usually leave the tone all the way up...
  14. keyboardguy

    keyboardguy Supporting Member

    May 11, 2005

    You're answering a 4 year old post; I commend you !! :D

    I will be interesting to see if the poster responds......

  15. He's probably spent the last 4 years covered in cobwebs refreshing this page.



    JakesAy likes this.
  16. blubolt


    May 18, 2005
    Turlock, CA
    I just found this post through Google. I noticed the OP stIll hasn't responded. Lol! Helpful info though :bassist:

    Still Waiting with the rest of you, lol! :D
  17. RiZzBot

    RiZzBot bass+beer+broken strap locks= :'( Supporting Member

    Nov 23, 2014
    210, Texas
    And still waiting!! :D
  18. m3llo


    Jan 11, 2005
    Hey. Still alive and responding to a 10 year old post hehe!
    Did that mod and very happy with the outcome :)
  19. This thread is 10 years old, but it's worth noting that 0.47uF is an order of magnitude too capacitive for use in a high impedance signal path. The appropriate value is 0.047uF.
    PawleeP, Will_White and Scatabrain like this.