#### Re-Pete

##### Senior member

- Messages
- 636

I know for single coils they recommend 250k pots and for humbuckers it's 500k.

And in cap size it's generally .047 for single coils & humbuckers .022.

I 'get' that it's 500k/.022 for humbuckers because that's a double equation to the single coil formula & there's two coils in a humbucker.

But I'm curious to find out if the original 250K pot/.047 cap was done to meet some electronic maths formula, coinciding with the pickup's DC voltage and Inductance?

And what's thrown me the curve ball for all this, is that I have Jazzmaster pickups that I know would sound much more open using 1M pots and .033 cap yet they are single coil?

So I guess I'm asking: Is there some mathematic equation/formula used to arrive at a certain ideal range number?

I suppose Leo originally used 250K pots because that was probably all that was available. But is there more to it?