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I recently had the volume/tone pots replaced on my guitar in hopes of brightening the tone a bit. We used 500K potentiometers, and while luthier was at it, I had him replace the capacitor. He used a Brazilian .022 oil filled cap. After brining the guitar home and pluging it in, it seems to have lost it's twangy sparkle - The guitar has gretsch "nashville/ Chet Atkin" style pickups in it. I can't remember what the original cap was rated at. Will replacing the .022 with a .047 give the guitar more shimmer?

Check the project guitar forum, all guitar-related answers are there. Extremely useful site.

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For a standard treble cut tone control, going to a .47 will give you less treble, the lower the value, the less treble the tone control naturally rolls off when it's turned all the way up.

Oddball idea: if you don't use your tone control...I don't...bypass it entirely. Wire in a bypass, if you want the option. On one guitar I used to have, I bypassed all the electronics in the guitar, and the improvement in tone was startling. Every component in your chain adds junk...especially caps. You can always drop them back in.

Not sure about values, but oil caps give a smoother sometimes syrupy presentation, which can be nice, but in this case not the desired effect. You could also piggyback the cap with a .01 poly cap, it gives the high frequencies a 'place to go' and should put some bite back.