#881730 - 03/04/01 06:05 PM
250K pots?
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rclogston@hotmail.com
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Registered: 11/17/00
Posts: 2
Loc: Warren,NH,UNITED STATES
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I recently tried out a Peavey Firenza with P90's, and was amazed at how much tone was available with the guitar's volume in the middle reaches. The repair guy told me it's because the guitar had a 250K volume pot instead of 500K, which most guitars have. I have to admit, it's much sweeter turned down than my strat or my 335. Whenever I turn my guitar volume down on either axe, they get very muffled. Is the tech feeding me a line, or does this make sense? If it does, I want to change pots on all my guitars!
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#881731 - 03/07/01 06:54 PM
Re: 250K pots?
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MidiMagic
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Registered: 02/01/01
Posts: 17
Loc: Bloomington,IN,UNITED STATES
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It's real. But it depends a lot on the individual pickup, the pot, and the amp. Impedance matching is a difficult subject.
First, the pickup is feeding the pot. If the pot has too high a resistance, it chokes out the signal coming from the pickup at lower settings. This is the effect you are getting, and it usually happens only if the amplifier input impedance is lower than the pot resistance. But if the pot has too LOW a resistance, it loads down the pickup itself, cutting the output drastically.
Next, the pickup/pot combo is feeding the amp. If the guitar has a much higher impedance than the input impedance of the amp, the input circuitry can load down the guitar. This is usually manifested as a loss of level and treble. High input impedances do not cause much change except maybe a change in tone, because the pickup isn't loaded.
So it is really an interaction of all three. The best case is probably where the pickup has half the impedance of the pot, which then has half the impedance of the amp input.
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