[R-390] capacitor analysis

[Jim Brannigan]

I have a cantankerous pot in an old Heath SWR bridge.
De-oxit fixed it for a while.....
Cai-lube seems to have done it...time will tell...

I use their dropper bottles....the spray gets all over....

Jim

> I'll echo exactly what Don has said, from first hand experience. The
saying 'a
> little goes a long way' is applicable here. What I've gone to doing even
on
> ceramic wafer switches is to take a paper towel or small cloth, wet one
small
> area with a burst od DeOixt red, then wipe the contacts until clean. If
they're
> in an inacessible area you're sometimes left with having to spary, but be
very
> careful to shield other areas. Always use the 'L' setting as it saves
liquid and
> prevents blasting everything in sight. As well, try making a swab by
wrapping
> the end of a long, narrow screwdriver or similar and proceed that way.
Caig
> offers swabs, but I have good luck using Q-Tips and making my own swabs,
then
> just spraying a bit on the ends. Same thing with paper for cleaning
relays.
>
> An order of supplies arrived last week and includes a can of CaiLube(blue
can).
> Unfortunately the rig I'm restoring has sealed pots, but I'll use it soon
on
> something else to get some idea how it compares to DeOxit for controls.
CaiLube
> says it's made specifically for moving contacts/controls, lubricates and
cleans.
>
> BTW, someone mentioned having the problem of a swelled wafer switch from
DeOxit
> and used a different chemical to remove it. Can't recall what it was -
mineral
> spirits? Acetone?
>
> 73 de Todd/'Boomer'  KA1KAQ
>
> Don and Diana Cunningham wrote:
>
> > John,
> > I don't post much on this reflector, just soak up the "wisdom", but be
very
> > careful "spraying" DeOxit all over things.  In my dealings with the
older
> > rigs, I use a syringe and pinpoint where I put DeOxit a drop at a time
and
> > have much better success.  DeOxit   WILL  swell phenolic (bakelite,
whatever
> > you call the material in most of the switch wafers) and ruin these
> > switches!!!  The syringe also helps put just a drop in tube sockets,
etc.
> > Just an observation from experience.
> > 73,
> > Don, WB5HAK
>
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