It could be a GE transorb which was a kind of a voltage limiter that was made by
GE about 25 years ago  -- it either is a MOV (Metal Oxide Varistor) or acts like
one.  I do know that they were red and looked like disc capacitors -- otherwise
I really don't remember much about them.

See:  http://209.134.106.21/articles/spike.pdf

Rye

"mike.dennison" wrote:

I have at last fixed the PSU problem that killed one unit of my Decca Tx
units a few months ago. I am at present running about 600W RF (75mW ERP)
from two units, after using 100W RF for some time.

The dead Tx unit still works but not very well. A component across one of
the transistors burnt out. I have a diagram but do not recognise the symbol
(perhaps a temperature variable resistor?). It is called R31V and the symbol
looks like a preset potentiometer, but it looks just like a red disc ceramic
capacitor.

If anyone has a faulty Tx unit and can spare one of these components, can
they send me one (I can supply my address by private e-mail)? Also, can
someone explain what this red disc is, and what it does. Only two of the
four transistors have it.

With your help, I hope to run close to a kilowatt again and increase the ERP
to 120mW!

Thanks.

Mike, G3XDV
http://www.lf.thersgb.net
====================