I think some early Motorola auto radios worked off DC directly and had
tubes in the RF and transistor audio PA's. You might look for some
vintage auto radio schematics for tube numbers. I thing the 12AX7 tube
might be included.

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.




--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P