A tone control is a passive treble bleed circuit. With the tone control on 10, there's no bleed of treble frequencies to ground, no matter whether you're using 250k, 500k or 1meg pots. They're all equally as bright as the pickup will allow.
The only way you can make it a bit brighter is by eliminating the pot entirely, which removes its resistance load from the circuit. As amptech said earlier, you can do that either by removing the pot and wiring direct, or you can buy one of those no-load tone pots which do the same thing when the pot is all the way up, while still allowing you to roll off treble when you turn down.
Am I mistaken in the notion that using no load pots can produce the same effect as wiring straight to the jack??
- georgestrings
Yes.