[sdiy] Pots for Oberheim SEM

[KA4HJH]

>Okay, Here are the details on the ones that I have: The wiper on these 100k
>linear pots goes through the usual 300 degree arc. But the 1/4 inch diameter
>by 3/8 inch long shaft makes more than 10 complete revolutions. The 1/4 inch
>shaft is only 0.100 inch diameter once inside the pot. Three large ball
>bearings are pressed against the shaft and the outer shell. The bearings
>make a planetary reduction. Cool!

This is basically the same construction. As I recall the whole device is
one unit, not a separate pot/cap and planetary drive as I've seen used in
other devices (RF tuners, for instance). So you have to replace the whole
thing if the pot goes bad or the drive gets flaky. I don't know if it would
be possible to substitute a separate pot/drive without making some serious
modifications to the whole SEM.

These sound like they would work. The original is 50k but a quick change of
the series resistor and you'd be all set--if the whole thing fits, the
knobs are the right sizes, etc. Minor point.
-- 

Terry Bowman, KA4HJH
"The Mac Doctor"

"If I can't be God I don't want to play"--Aleister Crowley