[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 almost impossible to get to the R-390 XTAL rotary 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 of 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
>
> ----
> Visit www.qth.net to subscribe/unsubscribe OR
> send mail to majordomo@qth.net
> with the BODY of the message containing:
> unsubscribe r-390
>