[sdiy] Center tapped pots, was ELMA 020-3325 + 041-3020 Classic Collet knob (or lookalike) source?

[David Moylan]

On the topic of center tapped pots, this is the only one I've found, 
Bourns PTT series:

https://www.mouser.com/datasheet/2/54/PTVPTT-3392396.pdf


They're 11mm and not as tall as the typical 9mm pots.  I don't love 
plastic shafts and they have a little more wobble than I like, but I've 
used a couple hundred of them and haven't had any failures.

I was in contact with a Taiwanese manufacturer who makes a clone to get 
ones with extended threaded bushing so they could be used alongside 9mm 
pots and have the threads reach through the panel.  Min quantity is 2k, 
though.  I may end pulling the trigger on these though later this year, 
at 10k or 50k value (linear of course).  Feel free to contact me off 
list if it's something you'd buy a small quantity of (at least 10 or more).

It's a shame they're aren't more options for tapped pots.  They're 
really useful for tone controls and doubling up 2 modulation sources to 
the same pot.

Dave



On 4/4/25 4:36 AM, mark verbos via Synth-diy wrote:
> oops, sent from wrong email
>
>
>
> Todd,
>
> I went through the same while restoring Marshall Time Modulators and 
> EMT reverbs and compressors. It seems they are more available in UK 
> and Europe.
> The EMT 156 uses 4mm shaft ones too (like that Electronic Surplus link 
> has), which won’t work for you. I assume you want 1/4” or 6.33mm.
> Also good luck finding center tapped pots for the SEM. I bought 100 
> way back when Jürgen Haible had a custom run group buy like 20 years ago.
>
>
> Mark
>
>
>
>
>
>
>
>>
>>> On Apr 3, 2025, at 22:00, Todd Sines via Synth-diy 
>>> <synth-diy at synth-diy.org> wrote:
>>>
>>> Just trying to spec out some costs on doing a reSEMble clone, and 
>>> damn — these are expensive. Almost $7 a knob with indicator, more 
>>> with larger coarse /cutoff / resonance skirted knobs: $200+ in knobs 
>>> alone. FWIW, These are what Tom Oberheim used on the original SEM.
>>>
>>> Does anyone know of any suitable (with 95% accuracy) clone / lookalikes?
>>>
>>>
>>> Todd
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>
>
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-- 
David Moylan
Expedition Electronics
sonic adventures!
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