Originally Posted by ampegfuzz
The pot is frozen in full volume. That's why I'm replacing it. I would 100% leave the cap if the preamp was still there. With it gone, just seeing the caps usefulness in its current, always passive, state. Going to try the alligator trick with the cap before I replace the pot. Is there a easy way to tell if it's 250 or 500k pots?
Which model Musician is it?
You could check the pot value with an ohm meter (DMM or analog) after disconnecting the wires. Or, see if you can read all of the info stamped on the pot case.
With the pot full up the 330pf is essentially out of the circuit and you won't really hear its effect. It comes into play as the pot is "rolled down", bypassing signal (as a high-pass filter) around the pot.
Here is a schematic of the MC924 preamp I found in another post:
It shows a 500k volume pot, and a 300pf bypass cap as stock.