On 26/01/2010 4:51 a.m., Jim Lesurf wrote:
In , Ian Bell
wrote:
Jim Lesurf wrote:
In , Ian Bell


esr.co.uk do some centre and 41 position detent pots - they don't
mention the make.

Alas, they just seem to be the 'small pot with a detent collar'.


And how does that differ from the ALPS?

The Alps 40mm pots I am using are physically bigger and have tight and well
defined spec for things like level of attenuation for each step and the
tracking accuracy. I've used a number of them over the years and that has
satisfied me that they are reliable in terms of knowing what attenuation
you get, etc.

Simply putting a detent collar on any double gang pot doesn't automatically
provide that.

One reason for this is that smaller physical tracks would require greater
physical precison to obtain the same level of accuracy. But this also
depends on how well the pots are made. I have experience with the Alps
units, but have no idea in advance how well unknown makes will work.

Have you not seen any of the Alps 40mm type? if not, I can probably put up
a pic sometime. But clearly that won't in itself tell you the specs or how
reliable they are in long term use, etc.

Slainte,

Jim


I think I know exactly which pot you are looking for. It is the very one
that Quad used in their 44 Control Unit - 40mm Alps pot, Dual gang 500kohm
(stepped attenuator with 21 detents of approx 2db each ?). I've had a look
at one and the numbers on the back of the dual pot are :
024B-494.55KΏ x 2. Underneath this is another number : A3/12425

I've tried a search on these but haven't come up trumps but I suspect that
anyone wanting one could probably get them from Quad.

Mike