wrote:

Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.


In desperation, I once wired the triode section of a 6U8 into an
oscillator circuit that had been designed for one of those 12v space
charge tubes. It worked that one time, anyway.

I was replacing a pair of "VHF Triode-Pentode" tubes by Sylvania (I
don't remember the type number) in an FM to AM auto radio converter
whose performance really sucked. The other three stages were fairly
easily re-wired to work off an external 250v supply, but the oscillator
didn't look promising. The effort was a success. I think I at least
tripled the distance from the stations at which I could hear them.

73, CJ KØCJ

ORIGINAL MESSAGE:

On Tue, 09 May 2006 20:47:30 -0500, "Clair J. Robinson"
wrote:

In desperation, I once wired the triode section of a 6U8 into an
oscillator circuit that had been designed for one of those 12v space
charge tubes. It worked that one time, anyway.

*********** REPLY SEPARATOR ***********

That reminds me of a fun thing to do when you have too much time on
your hands. Design a tube type oscillator that will work on extremely
low plate voltage. How low can you go? 12 volts is easy. How about
three volts? Or one? Or less?

I'd be interested to hear.

Bill, W6WRT

thanks for all the replies and info