Cranky Charles pot sub question

[Chris]

Has anyone ever subbed the B25K Bass and Middle pots out for any other size?  I am wondering if, being and active tone circuit, it will mess with the tone or just increase the range.   I have some B50K but hesitant to try.

Any experiences anyone can share?

[Anonymous]

You can solder a 47K resistor across lugs 1 and 3 of the B50K pot.  That will give you a 24.227K pot with a slightly different taper that will likely not be noticeable.

[Cybercow]

While I’ve not built a Cranky Charles, I do know that a 50K Ω resistor across lugs #1 & #3 of a B50K pot will yield a 25K pot with a taper  approximating a ‘C’ type. Similarly two 25K Ω resistors could be tied across lugs #1 & #2 and #2 & #3 (respectively) to yield a 25K pot with a slightly altered taper.

Alternatively, the capacitor/resistor network values around each control could be futzed with match the B50K pots without adding resistors to them. I don’t know the formulas off the top of my head for determining the value requirements to match the existing frequencies involved in that tone stack; but they’re easy enough to sort out thru some Google searches. Or, considering the Tone TwEQ uses B100K pots for the lows and mids in its tone stack, you could try the values of those capacitor/resistor networks,

[Chris]

Thanks guys, I have some on order, but I was moreso wondering what the effect would be.  After reading a bit on baxandalls it would seem, as you said, the surrounding values would need to be changed to compensate for the change. The tone tweq as well has different values surrounding the pots.  I’ll prob just be patient and, as my dad always says, use the right tool for the job. 🙂

Great lesson on modifying pots as well!  Many thanks!

[Author]

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