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No, but it can take it away, and that is what georgestrings is trying to compensate for if I understand him right.
No amount of passive circuitry will add elements back to your tone that weren't there in the first place.
I am not an expert, but I really don't find anything interesting on 1M pots. Maybe if you are a dog, or a bat, you will notice some extra brightness, but the taper of the pot is not good at all. If you are a guy that uses pots a lot, its better to bring back your treble using some other methods, like installing an onboard buffer in your bass.
..As bright as the pickup and tone pot will allow is more correct. Correct me if this is not the case with TB+ circuits, but with the tone pot on 10 you bleed the trebles through whatever resistance your pot value is to ground via the tone cap. Not that I'd ever bother changing the value to 1M, because as you said the pot will have more like an on/off function and have a lot of useless travel, but it answers georgestrings' question.
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.
Yes.
+1 to Amptech - try it straight to jack and see. Sometimes, additional treble can increase clarity and give the illusion of higher output.
Going to a 1 meg pot won't change the output, and it won't be any brighter than a 500k pot with it turned up all the way. The change will be the point at which it starts to roll off high frequencies as you turn it down. Unfortunately, with some pickups a 1 meg pot acts almost like an on/off switch rather than a gradual rolloff. I don't know how the TB Plus would react.
Slightly more treble if you use 1 meg (or just make your tone pot a 'no load on full' pot by scraping away the end of the resistance track) is possible, but i would not worry about doing this if more output is the goal. The pickup impedance is so much lower than the resistance of the harness/loom so that is mainly what the amp will see.
Just bypass the circuit and run the pickup(s) directly to the amp, and see if it's worth doing something.
I don't think choice of a different potentiometer would increase the output.
That photo probably includes all of you in the world.
I just couldn't put one on any Gibson, they're so F%^&*$# ugly (sorry guys) that they just destroy the aesthetics of the bass they're attached to. Just my .02 tho.
