[sdiy] Anybody worked with real Moog System 55 ?

[Harry Bissell]

I'm sure that no gun-positioning servo would use the A-B Type J pots, they have
a rotational life of only 25,000 cycles. They are for human interface settings.

Remember these pots were used in guitar "wah" pedals, and frequently wear out
from cyclic use...

Most synths probably don't get tweaked that often, and well-maintained ones have
had pots replaced as needed....

(they can go bad from disuse as well)

H^) harry


----- Original Message -----
From: Graham Atkins <gatkins at blueyonder.co.uk>
To: jpdesroc at oricom.ca
Cc: synth-diy at dropmix.xs4all.nl
Sent: Tue, 28 Sep 2010 14:53:22 -0400 (EDT)
Subject: Re: [sdiy] Anybody worked with real Moog System 55 ?

On 28 Sep 2010, at 18:35, Jean-Pierre Desrochers wrote:

>> JP, those pots are military-grade.  Why do you think they won't be
>> good enough?  Is it just that they have been around for a long time?
>> These are high-spec very robust - and expensive - pots, way overkill
>> for controlling a *mere* analogue oscillator.
>
> I was wondering not for robustness but for
> temperature/humidity wiper reading stability.

Any pot that did exhibit such problems wouldn't be much use in any
application. It isn't as if it will be used outside in a Mil  
application like
a (Tim !) servo on a gun positioning system where a moisture sealed
pot would be needed.

Graham


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-- 
Harry Bissell & Nora Abdullah 4eva