[R-390] switch contact cleaning question

[Joe]

 I don know it this was a good idea but it was the only thing that worked
 after several people trying.
 Its almost allmost impossible to get to R-390 XTAL k switches without major
 surgery.
 I also made a steel hook tool and a 1/4 access hole to retention both wiper
 contacts at the bottom.
 After that:
 I cleaned off all the spray and silicone from past attempts and brushed in
a
 past Oxy clean.
 Scrubbed with pipe cleaner, rotating
 Rinsed with distilled water followed by gas line antifreeze (Alcohol) let
 dry
 Then used 50-50% Cramalon Blue and red.
 Its been 10 years and no more needing to jiggle, the contacts still look
 good after inspection last month.
 The 2-1oz's of Caig Labs  http://www.caig.com/distrib.htm  pure Cramalon
 Blue and red cost me more than the radio at the time.
 I dont see the pure 1 oz 100% DeOxit  viles anymore,that was good stuff !

 Joe

> ----- Original Message -----
> From: "Dave Metz" <metzd@intelos.net>
> To: <r-390@qth.net>
> Sent: Wednesday, December 26, 2001 10:14 PM
> Subject: [R-390] switch contact cleaning question
>
>
> > I'm sure this has been posted a few times but I cannot find a reference.
I
> > am working on an R220 that looks something like the R390A but is  closer
> to
> > a shipanchor at 40 plus tubes!. Anyway, I am looking for some
suggestions
> > as to how to clean a badly oxidized wafer switch---it's black! I have
> > sprayed deoxit on it to no avail. It sort of looks like I need something
> > that has the ability to cut through tarnished silver. Fortunately, the
> > switch is able to be pushed back and brought out into the open. Now, I
> need
> > to put something on a q-tip, but what is the mystery. I'm thinking of
> > tarnex but am a bit gunshy till I check with the wisdom of this group of
> > experts.  In advance, thanks for any pointers.
> >
> > 73's
> > dave
> >
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