[R-390] Cleaning sealed pots?

Sun, 18 Apr 2004 18:56:46 -0700

Randy-
it is possible to open the pots- both CTS and AB-by un-doing the tabs
that hold the back in place..this allows cleaning and luberication.....it
also allows inspection of the carbon film and wiper. some times the
carbon film has been damaged, how i'll never know....but if it is
slightly raised or has a raised/bump, do not try and
clean(scrub..pressure etc...) the raised area only further damage will
occur not much can be done except replacement of the element. i've been
able to change shafts/elements....having lots of pots with the wrong
shaft/configuration..then again it is nice to have a machine lathe to cut
off the peened/crimped areas holding the wiper, drill and tap the shaft
then replace/reinstall the wiper. 
Ron

On Sun, 18 Apr 2004 19:47:54 EDT [email protected] writes:
> Good evening all
> 
> 
> I am working on a R-390, with sealed pots for the AF and line gain 
> pots. Both 
> are very erratic, obviously need to be cleaned, but, they are the 
> high 
> quality sealed units. The quality is nice, but how do you clean 
> them? Can one very 
> carefully drill a hole through the side, with a bit of grease on the 
> bit, and a 
> drill stop, and then spray in a bit of Deoxit? They don't look like 
> they 
> would be easy to disassemble either.
> 
> Any thoughts would be appreciated.
> 
> Randy
> 
> 
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