Spark plate

[John M Iverson]

Hi there   a "spark plate" ia a very rudimentay capacitor, usually a
copper plate, heavy foil  cemented to the inside of the case. the dc
power lead connected to the plate on one corner, the lead to the line
switch also to the solder joint. the cement is the dielectric of a this
capacitor. it's purpose  to by pass noise spikes to ground that normally
caused trouble in the tube type car radios.. many more things were used
in thosedays.   sorry about the long  note.   jack
Jack Iverson    K0EWU    jackiv at juno.com

On Fri, 27 Mar 1998 22:51:47 -0800 Jerry Seligman <w7bun at wa.net> writes:
>I'm teaching a class on radio repair, and a student asked, "What is a
>spark plate as used on early car radios?" I've never heard of this
>term,
>nor can I find a reference in any book I have.
>
>Can someone enlighten me? What is it? What is it made from? What does
>it
>do? How does it work?
>
>Thanks for your help.
>
>Jerry W7BUN
>
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