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Ralph Mowery Ralph Mowery is offline
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Default Oldtimer question (valves/tubes)

In article , says...

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.


Those awful high impedance ones, by any chance?





Some of the older ones that were around 1000 ohms or more impedance
phones. The lower ones would not work.