Jack Casady bass prob...
I've had the JC for about 4 years. Bought it new, love it to bits but I'm pulling my hair out with the electrics. The pots have been a problem from the outset - they crackled & buzzed like crazy if I even looked at them, much less adjusted them. Couldn't get any of the 2.5K pots anywhere - after about a year of searching, the Gibson Europe people (I'm in the UK) came up with 2 pots...soldered them in and...same as the old pots. 2.5K is such a rare pot value that I gave up on the traditional sources & got some from an industrial component supplier...hey, no more crackle & buzz. It's required some mods to get them to fit, and the taper is less than ideal but they work.
Which brings me to the real purpose of this post - when the volume is backed off even a hair from full volume, the tone opens up fully, regardless of the tone pot position. The bottom line is that as soon as the volume is backed off from full, the tone pot is effectively taken out of the circuit. Yeah, I could leave the pots alone and adjust off the amp, but this is a real pita...just not flexible enough on stage. I'll say at this point that this problem has been there since the bass was new, and so is not a result of the new pots. Also, the varitone circuit has always worked fine.
I've thought about ditching the pickup & electrics and replacing with a more conventional system, but I love the unique sounds the JC is capable of, and so am loathe to do this.
If anyone has any ideas on this I'd be eternally grateful - I really want to make this bass work as it should.