Off-subject--sort-of!

[multi-volti at MULTI-VOLTI.COM]

Silver oxide is conductive at VHF and higher.

Murray

----- Original Message -----
From: "john" <johnmb at NC.RR.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, July 31, 2002 9:12 PM
Subject: Re: Off-subject--sort-of!


> If it's silver, and it's the black oxide you're concerned about , fear
not!
> Silver oxide is conductive!
> 73
> John wb5oau
>
>
> At 01:16 PM 7/31/02 -0500, Fred Olsen wrote:
> >
> >Allen Heibeck wrote:
> >
> >> The vintage test equipment- Heath, Tektronix scopes,
> >> etc,  used BNC connectors (silver-plated?) ...
> >> What is a safe way to clean-off years of oxidation
> >> without leaving an undesirable coating?
> >
> >Allen, if the BNC is "on-Heath" it's "on-topic".
> >I've had good results cleaning precious metal connectors with Tarn-X.
> >It's strong, and will remove any patina in addition to oxides, but it
> >works.  Appropriate tools include cotton balls, toothbrushes, pipe
> >cleaners (mind the wires though), toothpicks - whatever will get where
> >you need to go.
> >
> >The caveat is that a soap and water wash afterward is required, plus a
> >thorough rinse and complete drying.  Water removal can be aided by
> >flushing with isopropyl alcohol - assuming there's nothing in the way
> >which might be damaged.  The isopropanol should be pharmaceutical grade,
> >99% or better, without any water in it.  No "rubbing alcohol".
> >'Silver cleaners' and 'polishes' will leave abrasives, waxes, all sorts
> >of mess behind.  Fine for cleaning silver-plated RF cans without
> >destroying the patina, but not for connectors.
> >
> >
> >> What will clean the scope graticule without the
> >> lines coming off?
> >
> >Always approach this with caution.  It's an individual-piece thing, and
> >also depends upon the markings being etched or silkscreened.  Some will
> >survive solvents, some won't tolerate water.  I'd suggest starting with
> >mild soap and water, applied with a Q-tip to the least conspicuous place
> >having markings.  If all is well try just using your hands with suds as
> >though you were washing them.  Use Fantastik, Formula 409, et al, and
> >alcohols or other solvents with extreme care on anything with markings.
> >
> >As always, anyone should feel free to tell me how dumb I am (IF you can
> >point out why).  ;<)
> >
> >Good luck,
> >Fred
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