For sale: Vacuum Capacitor:
Jennings VMMC-1500 (50 -1500pF).

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MAX Voltage (according to WEB search): 15000V.
The capacitance meter shows over 1600pF (in a fully "screwed state").
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Length about 40cm.
max. diameter about 15 cm.
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It was supposed to be a beautiful MAGNETIC ANTENNA... maybe someone else will find 
the time...

Condition: used, working.