What replacement pot for colorsound wah?

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What replacement pot for colorsound wah?

Postby white whale on Sat Jun 30, 2012 3:34 am

Just picked up an old 70's colorsound wah with inductor and tropical fish
However the pot is scratchy as can be and I would like to replace it
What is the best replacement pot? It should be 100k right?
Also read its a linear pot?
What would happen with an audio taper or icar pot?
Thanks
white whale
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Re: What replacement pot for colorsound wah?

Postby fernieite on Sat Jun 30, 2012 1:29 pm

Congrats! I love my old grey colorsound wah.
Contact Stu at Castledine Electronics. He'll be able to help you.
www.wah-wah.co.uk
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Re: What replacement pot for colorsound wah?

Postby Pauls R Best on Sun Jul 01, 2012 3:41 pm

I don't think wah pots use a linear taper. I believe they use what I've heard referred to as an S taper.
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Re: What replacement pot for colorsound wah?

Postby white whale on Sun Jul 01, 2012 4:46 pm

Yeah normally they dont use a linear pot but I think the colorsound is supposed to given its long throw and that the circuit compensates for the linear?
Anyone know the definitive answer?
If it uses a linear pot what would be the negative effects of using an audio pot or s curve etc?
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Re: What replacement pot for colorsound wah?

Postby JLee on Thu Jul 05, 2012 8:15 pm

From Stu's wah mod page(www.wah-wah.co.uk)
You can use any old pot, but cheap carbon pots will wear out in no time and standard log/lin resistance tapers aren't ideal for use in a wah. Commercial wah pots have a kink in the taper, where the resistance suddenly shoots up within a small degree of rotation. This kink is the point where the bass-treble transition is most noticeable, and which makes the wah so expressive.

A standard log (audio) taper pot will produce a sweep which is mostly treble, unless you sacrifice the high frequencies to get some low end - a pedal with an extra long throw helps. A linear taper pot will sweep more quickly from treble to bass, but it's a smooth sweep and not very expressive. For a "correct" Vox/Crybaby wah pot, there are a few options, but they are relatively expensive. The better ones are modelled on the resistance taper of the ICAR pots found in '60s Vox wahs. I have my own ICAR type pots, which I use in my own wahs and also supply as a replacement part.

Colorsounds use a cranked linkage to get a non-linear sweep from a linear pot. I recommend Bourns conductive plastic pots for these. Unfortunately, they're not available as a dual gang version for wah-swell pedals.


The grey JMI Wahs also use a linear taper pot. Using a audio taper pot does indeed give you more lows to highs in the sweep. The Colorsounds have such a long throw...might be interesting to experiment with a audio taper in the Colorsound. Bourns makes a suitable replacement. Bourns is what Stu used in his grey JMI clones, in addition to the current Sola Sound/Castledine Reissues.
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