Is there a dual concentric blend pot?

Webtroll · #1 08-10-2007, 12:26 AM

Is there a dual concentric blend pot? With both parts capable of pickup balance with a detent and full for both pickups in the middle? At 250k? I'm thinking of a 3 pickup combination and this would use less space than 2 separate blend knobs. Anyone know?

The Penguin · #2 08-10-2007, 12:34 AM

http://www.stewmac.com/shop/Electron...Pull_Pots.html

Webtroll · #3 08-10-2007, 08:09 AM

Very nice! I haven't used Stew Mac before, will need to take a look around. Thanks!

mikezimmerman · #4 08-10-2007, 08:23 AM

Most standard blend pots--including this one for StewMac--are "dual concentric" pots, that is, two volume pots stacked on top of each other. Obviously, that only works for blending two pickups.

I've never seen a stacked dual-blend pot. I'd guess that would take *4* concentric pots. There may be a way to wire a blend with a single linear pot, in which case you could get a regular stacked pot and wire it up for two blends, but I don't think you'd get the same "both pickups at 100%" setting in the middle.

Mike

Webtroll · #5 08-10-2007, 08:27 AM

Aye I took a closer look at that pot and it's a standard blend pot. It's a shame, it seemed like a good idea to me but as most basses have one or two pickups at most I can't imagine there's a demand for them.

C-5KO · #6 08-10-2007, 08:40 AM

Quote:

Originally Posted by mikezimmerman

Most standard blend pots--including this one for StewMac--are "dual concentric" pots, that is, two volume pots stacked on top of each other. Obviously, that only works for blending two pickups.

I've never seen a stacked dual-blend pot. I'd guess that would take *4* concentric pots. There may be a way to wire a blend with a single linear pot, in which case you could get a regular stacked pot and wire it up for two blends, but I don't think you'd get the same "both pickups at 100%" setting in the middle.

Mike

Warwick makes a stacked blend/vol pot - if that helps. I'm guessing that a stacked dual-blend (if it exists) would be a pain to squeeze into your control cavity.

Warpeg · #7 08-10-2007, 06:43 PM

Warwick/MEC can make this for you. They also have a readily-available stacked pot (250 or 500k) with a blend pot on the bottom, regular linear taper pot on top, and push/pull dpdt top knob! Talk about an amazing pot! This pot is standard on the Thumb NT, Infinity NT, etc.

The Penguin · #8 08-10-2007, 07:22 PM

Quote:

Originally Posted by Webtroll

Aye I took a closer look at that pot and it's a standard blend pot. It's a shame, it seemed like a good idea to me but as most basses have one or two pickups at most I can't imagine there's a demand for them.

So you're looking for a single shaft with 2 blends knobs in the same way an old jazz bass has a single shaft with 2 volumes? That's not as simple as what I thought you meant

A9X · #9 08-11-2007, 01:14 AM

Two resistive elements on a common shaft, ie varied by one knob, is not dual concentric. Dual concentric means that there are twioresistive elements individually varied by two shafts that are coaxial and two knobs that are (usually) stacked. Bass abd treble controls with a stacked knob are an example of this.

A blend pot doesn't need to be dual concentric.

Dual concentric
http://www.warmoth.com/hardware/images/parts/pot_3.jpg

Webtroll · #10 08-11-2007, 01:29 AM

I know it was a bit redundant but I was trying to be clear about what I was looking for. Sorry for any confusion!

A9X · #11 08-11-2007, 02:53 AM

Quote:

Originally Posted by Webtroll

I know it was a bit redundant but I was trying to be clear about what I was looking for. Sorry for any confusion!

No worries mate, I just wanted it to be clear for everyone else too.

metalmariachi · #12 08-11-2007, 05:40 AM

Are you asking about dual concentric pots, which are 2 pots with 2 shafts, or about dual ganged pots, which are 2 pots with 1 shaft?

The dual ganged are pretty common & available through mouser, Stew Mac etc.
Dual concentrics are a little more difficult to find, and so far I haven’t found any linear tapers, in consumer quantities, only log.

MM

Webtroll · #13 08-11-2007, 11:58 AM

1 dual shaft like you see with onboard EQs often times. I was thinking of setting up 3 pickups and using 2 pans to balance between them and thought it would be cool to have the panning for all 3 pickups concentric instead of 2 separate pots.

A9X · #14 08-11-2007, 01:34 PM

Quote:

Originally Posted by Webtroll

1 dual shaft like you see with onboard EQs often times. I was thinking of setting up 3 pickups and using 2 pans to balance between them and thought it would be cool to have the panning for all 3 pickups concentric instead of 2 separate pots.

I can see how to do this actively with individually buffered pickups via a custom pre, but unless you had a 2x2 concentric pot (probably too deep to fit in a bass) I'm not sure it's possible passively. Even with a suitable pot stack I have a feeling that it would likely load down the pickups too much on many settings, but I'd need to simulate it to confirm.