Anyone know if it's possible to rebuild a vacuum variable cap? It would
require a precision break of the seals, then evacuating the air with a new
seal.
A cap used on my 160m transmit "T" failed a few months ago. While
dismantling the antenna at the season's end, I brought the cap back home and
purchased a Megger 230425 Hi-Pot test set. After testing today, the cap
repeatedly breaks down at 700V, although it's rated for 5KV.
It would be a shame to discard; it's an expensive Jennings ceramic type with
a range of 25-5000 pF. Used, they're $1,500 ea. from MaxGain Systems. I
only need a range to about 1200 pF, so I can definitely get by with an
alternate that's on the shelf. That's not the issue. I would like to save
the cap if possible. I'm not sure what conglomerate owns Jennings now but I
doubt they would have a rebuild service when it's much more profitable to
sell new caps.
Paul, W9AC
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