I think some people leave them dimed all the time because it sounds best that way...on THAT guitar. I recently put a gold foil pickup in an old archtop, and the tone control works so beautifully. On some other guitars, it seems like anything I do to the tone knob just adds successive layers of blanket over my amp, and it's actually a "DULL" control. On other guitars there are varying degrees, like, I can roll this one off 2 or 3 numbers before it becomes a DULL control. Has anybody noticed this and really worked with it? Is there a magic formula for components that give the sweetest sweep of the tone control? If the tone pot is a DULL control, what's the first thing you go for? Pot value? Cap? Audio pots make a positive difference for me; the cap makes some difference, as does the value of the pots. The one that works so great, BTW, has some 500k pots that I had, but, they both read about 300k and a .022mf cap.