On 15 Sep 2005 01:27:23 GMT, Steven Swift wrote:
A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

A goolgle for "space charge tubes" will probably turn up a lot
of info on low voltage tubes.

The Summer 2005 edition of Sprat, the GQRP club magazine, has a circuit
for a vfo using a XFY43 hearing aid valve/tube running off 12V. Better
stability than a fet oscillator, apparently.

--
Cheers,
Stan Barr stanb .at. dial .dot. pipex .dot. com
(Remove any digits from the addresses when mailing me.)

The future was never like this!