I built a two tube radio about 20 years ago using 01A tubes. I put 5 regular 9 volt batteries in series to give 45 volts for the radio. Worked fine.
You know you can plug the 9 volt batteries + to - using the connectors on top?
Paul
1920s radio
Aug 27, 2019
24 Replies
Not a bad idea. They'd last ages too.
NT
They sure would. Their combined internal resistances would see to that; law of diminishing returns and all that. You really need to establish what the likely anode current will be. Amazing what they did with just one tube, though! Got to admire the resourcefulness that went into such designs.
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2-3mA. PP3s can kick out over 100mA.
Oh yes. Resourceful was the name of the game for a long time, now that silicon's cheap few care about efficiency or smart tricks.
NT
Maybe "graphene" seems slated as a pseudo-silicon replacement at that, too.
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