Pot: Active treble boost passive cut ala Dingwall

[basadam]

A single pot consisting of two actual pots; mid point up it's 25K and boost only, down it's 250K and cut only. Where can I find such a thing? (Internet dealers shipping overseas, since I'm not in USA)

[luknfur]

FWIW:

Don't know whether Dingwal sells parts but that would be my first check since that's a freak pup. This is the first I've heard of such a pot. There are some distributors that sell hard to find pots but I don't know them off hand - just have seen them mentioned in TB threads - try a search.

Bump

[SDB Guitars]

Originally Posted by luknfur

Don't know whether Dingwal sells parts but that would be my first check since that's a freak pup.

This particular circuit is a Dingwall trade secret, and I have not found anyone who has been able to replicate it with off-the-shelf parts.

I can't really blame Sheldon for not letting the secret out, it definitely gives him a significant edge, having a feature that no one else can seem to replicate... this, along with his already top-notch product, and he's still the only production shop doing fanned-fret basses, right? There's a reason to buy Dingwall basses, or rather, several reasons. I'd own one, if I could afford it.

I would think the circuit itself would be easy to replicate *if* you could get a ganged pot with 25K on one and 250K on the other, where the center detent is 0% of the 25K and 100% of the 250K. But good luck finding that. I spoke with several potentiometer manufacturers who each wanted several thousand dollars just to *prototype* said ganged pot, and then wanted a minimum order of hundreds or thousands of them. *Well* out of *my* price range.

Once upon a time you could get a stacked (not ganged) pot with 25K/250K from SHP Hiatus but that was a custom build, and he's currently on hiatus. Someplace that does custom pots could probably build this, but you're still looking at a pretty substantial cost. It would do the job, just not as elegantly as you will find on the Dingwall basses.

[FunkMetalBass]

Originally Posted by SDB Guitars

Once upon a time you could get a stacked (not ganged) pot with 25K/250K from SHP Hiatus but that was a custom build, and he's currently on hiatus. Someplace that does custom pots could probably build this, but you're still looking at a pretty substantial cost. It would do the job, just not as elegantly as you will find on the Dingwall basses.

You could do it yourself if you just wanted a concentric pot with two different resistance wafers. Just buy two resistors and swap wafers. As long as they're the same size, that's an easy swap. To make it easier, just buy the two pots from the same manufacturer.

Matter-of-factly, you could do the same thing with a dual-ganged pot. I'm not sure how the Dingwall pots are assembled, though. You'd have to ask someone with a Dingwall to take measurements.

[Stealth]

The only solution I can think of is a homebuilt stereo pot with mixed wafers (one 25k and the other 250k) with M/N taper, with the 250k acting as a passive tone before the preamp and the 25k acting as active tone inside the preamp. That way, in the center position neither the passive tone cut nor the treble boost is active, towards one end, you get a passive tone control, towards the other, it affects the preamp's behavior and boosts treble.

[walterw]

You could maybe wrangle a regular 250k M/N and put a resistor across one section to make it 25k.