On Sun, 13 Feb 2005 04:03:16 GMT, "John Franklin"
wrote:

A VACUUM capacitor is exactly what the name implies, the VACUUM
is the dialectric instead of paper or air.
It has bellows that is air tight, or should I say vacuum tight.


The other responder described an "adjustable" vacuum capacitor. The
more general vacuum capacitor has no bellows. The plates of a vacuum
capacitor are concentric or coaxial conducting tubes, which is not
that important. The important things are that they are sealed in
relatively heavy glass envelopes with electrodes at each end and are
capable of handling high RF currents at high DC potentials with
extremely low leakage.


Bob, W9DMK, Dahlgren, VA
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