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Educate Me On Pots

Strat Avenger

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Okay, I have known for decades about 500k pots for humbuckers, and 250k pots for single coil but I've been thinking about it lately and there's something that I'm not quite understanding.
When the control is rolled all the way "up", it should read zero ohms, regardless of whether it's 250k or 500k (or 1 meg-ohm), so why would there be a reduction in high frequencies with the 250k at full volume?

Here's another question; My CTS pots (250k and 500k) read 0.1 ohm when rolled wide open, but I have 4 Bourns 500k ("low friction") pots that read from 5 to 7 ohms when wide open. What's up with that? Do those few ohms of resistance affect high frequency bleed to ground?
 
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