"mikeFNB" wrote in message
...
brasso and a tooth brush!
or brown sauce!

mike

"G "Guglielmo" Evans G4SDW" wrote in
message ...

"doug" wrote in message
...
"G "Guglielmo" Evans" wrote in
message
...
Having been donated a homebrew "L" antenna tuner, with
an unidentified roller coaster (about 1 1/4" in
diameter, with
a plastic facia turns counter marked "antenna loading"
with the
plastic facia looking like a CRT's barrel distortion,
any ideas
as to its origin, anyone?)

Snipping here....
Actually, toothpaste works very well. Its a detergent
and very mild abrasive which will often remove oxidation
without taking off too much metal. Brasso is too strong and
leaves a residue behind. There are cleaners with reducing
agents such as _Barkeepers Friend_ which are quite effective
in removing oxidation but they may also remove all the
plating where something has only a thin plating of silver or
chrome. Remember, the oxidation itself is metal that has
been removed chemically from the surface of the object. I
don't know of any way of replacing it other than replating
which is not always practical. Your roller inductor is/was
very likely silver plated.
Use the mildest cleaner first and more powerful agents
only if it doesn't work.
A toothbrush is an excellent cleaning tool.


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Richard Knoppow
Los Angeles, CA, USA