Mike Knudsen wrote:
In article om,
writes:

'm trying to identify some (tubes?) I got in a old beat-up piece of
equipment, and I would appreciate any leads. They have an octal base, a
grey metal envelope about 2" high, and are heavy as lead. The
manufacturer is "Voycall", and they are labeled "A50"
Anyone have any idea what these are?

Probably relays (often supplied in tube sockets), and probably with
high-pressure nitrogen and maybe mercury-wetted contacts inside -- don't cut
one open to see :-)

In this case it is probably a frequency-dependant relay for a selective
calling system.

Did anyone make transformers in that configuration?

Yes! Altec did, as did lots of other folks.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."