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Ralph Mowery

In article , says...

I'll have to look into that. I had no idea of such extraordinarily low
plate voltages as that. 9V eh? Wow! Do you happen to remember the type
number of those? I'd be fascinated to check out the data sheet for 'em.

At one time the car radios had low voltage tubes in them that just ran
on 12 volts . They could not supply the power for the audio output, so
a transisitor or two were used in the audio stages. Tubes worked well
for the radio frequency signals and transistors not so well in those
years.

Back in the eairly 1960's I built a one tube receiver for the airplanes
that ran on 12 volts only. Plans were in a Popular Electronics of the
same years. Had to use earphones for it.