Re: [sdiy] Group buys: Alpha-style, dual pots, and Joysticks (WAS: RE: Dual-gang reverse-log pot group buy ?)

rdrake rdrake at
Mon Nov 17 20:50:15 CET 2008

true dat.  but, i have fixed this pretty successfully by applying 1 or 2 layers of heatshrink tubing to the undersized pot shaft.  close enuf for folk music...

(reformed banjo player)

>----- ------- Original Message ------- -----
>From: Bruce Duncan <modcan at>
>To: synth-diy at
>Sent: Mon, 17 Nov 2008 13:57:02
>One thing to watch out for on Asian pots is the
>shaft sizes are often metric.
>Alpha makes a true 1/4" shaft while others are 
>often 6mm. It is not a big difference but
>North American style knobs will rotate in a 
>non-concentric way on shafts that are undersize.
>It looks wonky.
>I made this mistake buying from non-alpa supplier 
>and now have 1000 10K pots I can't use.
>At 09:23 AM 11/17/2008, you wrote:
>>Hey, if there's enough, I'm up for it!
>>And, I've actually found much better pricing:
>>Song-Huei quoted $0.16 each for 1000. They sent me
>some samples too, very
>>nice! Identical to Alpha, except their washers are
>a much tighter tolerance
>>so they pretty much stay centered without having
>to hold them while
>>tightening the nuts.
>>Even better, G&H quoted me $0.099 each at 1000
>MOQ! Harvestman told me about
>>them and let me check out a sample - I didn't
>think to check the washers,
>>but they are also just like the Alphas in feel and
>build. They also carry
>>those Illuminated caseless slide-pots I was
>>Dual pots: I've been hunting for affordable
>concentric-shaft duals, and
>>finally found some. Top-up has these 9mm duals:
>>55, and quoted $1.21 each at MOQ 1000. I was
>planning on getting B100k/B100k
>>pots for Coarse/Fine control on the upcoming Imp
>>Joysticks: I finally found these people and got a
>quote! This has been a
>>long quest, but they are worth it. These are the
>joysticks I use in the
>>Infernal Noise Machine (big one on the right):
>cks.jpg. They have a 90°
>>arc of travel and are the SMOOTHEST feeling
>joysticks I have ever used. For
>>the large, I was quoted $13.10 each for 500 for
>B100k, no center-return
>>spring, with knob. The small, same options, is
>$12.48. The USD is rather
>>unstable compared to the Yen right now, so the
>price will fluctuate a bit.
>>The standard resistance value for the joysticks is
>B10k. The pots are built
>>for each model - the large ones have pots that go
>from 0-->Rmax in 90°, the
>>smalls in 60°.
>>I've been drumming up interest in these on
>Muffwiggler and we're off to a
>>good start. The plan is to make the purchase in
>>flight at
>>-> -----Original Message-----
>>-> From: Andre Majorel
>[mailto:aym-htnys at]
>>-> Sent: Monday, November 17, 2008 5:45 AM
>>-> To: synth-diy at
>>-> Cc: flightofharmony
>>-> Subject: Dual-gang reverse-log pot group buy ?
>>-> Regarding the recent talk of a group buy of
>Alpha pots...
>>-> Parametric equalisers often use anti-log pots
>for the frequency
>>-> control. Would anybody be interested ?
>>-> If Kevin orders direct from Alpha, minimum
>order is one thousand
>>-> of each reference, meaning we'll be lucky to
>reach MOQ for *one*
>>-> value. Here's what the circuits I've seen use :
>>->   Moog 3-band
> :
>>->	 100 k dual for each band
>>->   Rane PE 15
> :
>>->	 100 k dual ("100KE" antilog assumed)
>>->   Rane PE 17
> :
>>->	 100 k dual ("100KE" antilog assumed)
>>->   Speck ASC
> :
>>->	 500 k single for the low band (simulated
>inductor, peak/shelf)
>>->	  50 k dual   for each mid band
>>->	 500 k single for the high band (simulated
>inductor, peak)
>>->   Ethan Winer's SVF
> :
>>->	  50 k dual   for each band (SVF)
>>-> What would be the best value ? 50 k ? 100 k ?
>>-> Don't know how much duals cost but the prices
>Alpha have quoted
>>-> for singles are pretty good (0.22 USD). At that
>kind of price, you
>>-> wouldn't need to stock both singles and
>>-> No promises, though. This is Kevin's group buy,
>it's his decision !
>>-> --
>>-> André Majorel
>>Synth-diy mailing list
>>Synth-diy at
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