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Pot Reading

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


  1. EZ9R

    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?
    Thx
     
  2. Hi.

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

    Regards
    Sam
     
  3. KimblesNimble

    KimblesNimble

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

    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

    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

    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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