back to amateur radio and the theme "ATU capacitor",

see http://home.online.no/~la8ak/a1.htm for an idea how you can
convert an old BC capacitor to a high voltage variable capacitor for a
80 (40m) antenna tuner

LA8AK
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J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm