JENNINGS VACUUM CAPACITOR
32,000 Volts
These might be very useful in TESLA COILS!
Jennings vacuum capacitors are small, vacuum-dielectric
units intended principally for use as all or part of the
plate tank capacitance in radio-frequency amplifiers or
oscillators. They are also frequently used as
high-voltage coupling and by-pass capacitors at high
frequencies and as high-voltage neutralizing capacitors,
when used in conjunction with small high-voltage variable
capacitors having a small capacitance range. The use of
a vacuum as a dielectric permits the construction of a
comparatively small lightweight capacitor for a given
voltage rating and capacitance. In addition, the effects
of dust and atmospheric conditions on the capacitor
are eliminated by sealing the plates within a glass
envelope.
The sum of the peak R-F and D-C voltages must not exceed
the peak voltage rating of the capacitor!
Jennings vacuum capacitors are provided with terminals
which allow the use of standard 60-ampere fuse clips for
mounting. These clips must be kept clean and must at all
times make firm and positive contact with the capacitor
terminals. Failure to maintain a low-resistance contact
to the capacitor terminals may result in excessive
heating and permanent damage to the capacitor seals.
Taken From: Tesla List
( mod1-at-pupman-dot-com )
I would describe it as a diode as it has only two pins,
that is cylindrical with a diameter of approximately 2"
and length of 6". One pin on each end. It is a vacuum
capacitor.
Typical values are in the 10-100 pF range with voltage
ratings in the kilovolt range. The Jennings ones are
usually made of copper, Eimac used other materials in
the ones I have seen. They can be used in tube coils
as they are low loss (vacuum). I have also heard of a
few people who used them as experimental spark gaps,
although they foul after a while (quiet though)
From -
Mark S. Rzeszotarski, Ph.D., Senior Physicist, Radiology Dept.
The Mt. Sinai Medical Center, Cleveland, Ohio 44106
Assistant Professor, Case Western Reserve University
Departments of Radiology and Biomedical Engineering
Voice:216-421-4689 FAX:216-421-5343 E-mail:msr7-at-po.cwru.edu