>Yesterday I picked up a couple of multi-section air variables that I hope
>to possibly use (one of them) in my amp which is being rebuilt. The old
>load C has significant arc marks.
>
>Anyhow, one of the caps is a rather large 4 section device. It has what
>looks like more than adequate spacing. I figure that I can calculate the
>capacitance range of each section by resonanting it with a known inductor
>at each end of the range. Each section also has mica trim caps on it for
>finer adjustment. Hopefully, the range will be good for my 4-1000A.
>
>Anyhow, the cap is REALLY dirty. It's got tons of dust and crud in its
>housing that for obvious reasons I want to remove. So, what's the best
>way?
Air-variable capacitors can be cleaned in a dishwasher. However, they
should be tested on a high-pot. to make sure that the ceramic, or
whatever, insulation is sound. I have seen used a-v capacitors which
were removed from equipment that was lightning-damaged, which had
(unseen) internal damage to the ceramic insulation. . G-10 material is
easy to cut and drill. It has excellent RF characteristics. G-10 can be
used to build replacement insulators.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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