Variable caps

[Gordon Pritchard]

On Sun, 2003-02-23 at 17:14, Mike Penzo wrote:

> I just restored an old Silvertone AM tube radio this weekend.  It now
> works fine except there is quite a bit of static and popping when the
> main tuning (air variable) cap is rotated.  The cap is quite dusty and
> dirty.  Would some electrically conductive grease help in this case also?

        In working on old vehicles, I commonly use anti-seize compound on bolts
(especially stainless). This is basically a grease that is loaded up
with either nickel or copper (appearing grey, or coppery,
respectively).  That might be what you're wanting...

        My own preference for switches and variable caps, however, has been a
good hosing with aggressive contact-cleaner.  Radio Shack sells some
stuff, so does MG Chemicals, and others.  Blu-Wash is one trade-name I
remember.

        I guess a person could use contact-cleaner, followed by anti-seize
compound.

        -Gord

--
Gordon Pritchard, P.Eng. VA7GP   | Institute of Electrical and
Research Labs Manager            |      Electronics Engineers
Simon Fraser University, Surrey  | Quarter Century Wireless Ass'n
gordonp at sfu.ca                   | Telephone Pioneers of America
phone:  604.586.6186

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