[Boatanchors] Capacitor Information?

[Pete Lancashire]

Quite the background

http://cardwellcondenser.com/our-rich-history/


On Mon, Mar 31, 2014 at 9:49 AM, Michael D. Harmon <mharmon at att.net> wrote:

> Hi Folks,
>
> I bought a big Rubbermaid bin of components from a Craigslist seller
> across town yesterday,
> and have been going through the goodies trying to identify just exactly
> what I have.
>
> One of the 'finds' in this box of junque is a pair of brand-new in-the-box
> Cardwell Condenser
> Model 9801 capacitors.  These caps look like variable caps, but they are
> not.  They are air
> dielectric fixed capacitors.
>
> The caps have ceramic end-plates 2-1/4" X 2-1/4".  There are steel support
> posts at the four
> corners, comprised of 6-32 threaded rod with 1/4" spacers.  There are 19
> plates spaced on
> 1/8" centers, separated by the spacers on the threaded rod.  Half of the
> plates are connected
> to the upper-left and lower-right rods, and half are connected to the
> upper-right and lower-left
> rods.  The end plates are secured with lockwashers and nuts at both ends
> of the capacitor,
> with 1/4" of threads extending at one end of the cap and 1/2" at the other
> end.
>
> I have never seen a fixed air-dielectric capacitor like this before.  I
> assume that they were
> designed for use in a transmitter circuit, based upon the plate spacing.
>  According to my Tektronix
> 130 L-C meter, the value is approximately 155 pF.
>
> Has anyone ever seen anything like this before?
>
> Mike, WB0LDJ
> mharmon at att dot net
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