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Pot Reading

Discussion in 'Pickups & Electronics [BG]' started by EZ9R, Apr 20, 2010.

  1. EZ9R


    Oct 28, 2008
    I bought 2 Fender 250k Aud. pots from GC. I used my multimeter on them and 1 read 256 and the other read 197.
    What does that mean?
  2. Hi.

    It means that the first one is well within' the +/-20% tolerance, the other ever so slightly over the tolerance range.

  3. KimblesNimble


    Jan 10, 2008
    T-Bird, could you expand on this a bit?
  4. EZ9R


    Oct 28, 2008
    I did research that and read about the +/-20% tolerance. So which one is better or should I say, will either one effect my tone? These are CTS pots. I bought 2 to replace on a jazz bass. So is it more common if I were get a 250k and the reading is around 197-200. I have some old 250k which read around the same area of 197.
  5. EZ9R


    Oct 28, 2008
    From what I read, most pots aren't created equal. The papers the came with the cts 250K pot say that the pot has a +/-20% Tolerance Reading. I guess meaning it's within the 20% 250k. 20% of 250k is 50 and the first pot read 197k. My question is: 1 read 197k and the other read 256k. Does the +/- 20% Tolerance mead below 250k only?
  6. It's very difficult to ensure that every part has a resistance of exactly the value it's rated for when you are mass producing potentiometers.
    With a 20% tolerance, it is acceptable for a pot to stray as far as 20% higher or lower than it's rated value.

    You got one good pot, and one that went outside of the manufacturing tolerance.

    I would replace it with another pot of a tolerance closer to the rating.
  7. The 197K pot will have less volume/treble than the 256K pot.
  8. MatticusMania

    MatticusMania LANA! HE REMEMBERS ME!

    Sep 10, 2008
    Pomona, SoCal
    I usually just ask the guy behind the counter.
  9. EZ9R


    Oct 28, 2008
    Don't mean to get side tracked, but What counter? Guitar Center? Sorry for the bashing, but the 3 Guitar Centers in my area has some braid dead people working there. I live in No. VA. Chuck Levins is great. The old Venemans was great too. Case in point: I was using Rotosound Swing 5 string (45-130) for $26 back in 2003-2004. I wanted to by a set of Swing Bass 40-125 and they were $35. They guy there said they were different types of metal an therefor more expensive. Not bashing all Guitar Centers.
    Any way, Next time , I'll just bring my mulit-meter in and test the pots right there. Sure they're $7, but that can add up. .
  10. $7?
    CTS pots shouldn't cost any more than $4-5.
    Mini pots should only cost $2-3.

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