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.
Ed
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