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DC Cox wrote:

perhaps only for a very small vacuum tube coil.

main reason is the capacitance is usually too low and the units with higher
capacitance are very large physically.
this is due to the fact they use only air as their dielectric.

Dr. Resonance

Actually vacuum as the dielectric, but since air and vacuum are essentially the same dielectric constant, the comment still holds. Physically large for the amount of capacitance, compared to something with a solid dielectric."

True but, compared to air dielectric capacitors, "vacuum capacitors" are much smaller for the same capacitance and voltage rating. Very expensive gadgets requiring extreme care in manufacturing and outgassing.


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