[sdiy] [AH] Re: How to repair potentiometers from a Moog parametric

[Florian Anwander]

Hello everybody

I just wanted to let you know the results:

Short summary:
it is not possible to repair the original potentiometer with parts of 
new potentiometers (those are not compatible in any way).
it is not possible to build a special double potentiometer from new 
standard potentiometers.
I will have go the costy way and order potentiometers from 
potentiometer.com.


Details:
I tried three variations from Alpha, two from CTS, and one noname 
potentiometer.

Most problems are caused by the fact, that the shafts are kind of 
crimped into the slider parts. You have to destroy the sliderpart, to 
remove it from the shaft. So it is not possible to use the sliderpart in 
the old potentiometer, and it is not possible to build a special double 
layer version from two standard versions.
Also there is no chance to repair the original potentiometers using the 
resistance layer of a new potentiometer. The original potentiometers 
used raised center contact strips, while all today 24mm potentiometers I 
tried have flat center contact strips. Bending the slide contacts for 
the center contact was not reliable.
If I could use the new slider part too, it would work, but I have to 
destroy it, when I remove it from the original shaft. :(


Florian


Am 27.09.2011 17:30, schrieb Florian Anwander:
> Hello Mike
>
> Am 27.09.2011 17:18, schrieb Mike Beauchamp:
>> Are these CTS pots? I recently cleaned up some old CTS pots on a
>> Fender amp recently and these look exactly the same. I actually
>> replaced a few of the pots with new ones as well, and the new
>> production units appear unchanged.
> Ah, this is a first hint for the make of this potentiometer.
>
> I'll try to get some of them. Thanks!
>
> Florian
>
>
>
>