Vacuum tube battery
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In the early days of electronics, devices that used vacuum tubes, such as radios, were powered by batteries. Each battery had a different designation depending on which tube element it was associated
Eveready 742 "A" battery with 1.5-volt Fahnestock clip terminals
Eveready 762-S "B" battery with 45-volt & 22.5-volt tap screw terminals
Eveready 761 "C" battery with 4.5-volt, 3-volt, 1.5-volt tap screw terminals
Vacuum tube
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A vacuum tube, vac tube, electron tube, thermionic valve, or tube is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been
Vacuum tube battery
…In the early days of electronics, devices that used vacuum tubes (called valves in British contexts), such as radios, were powered by batteries. Each battery had a different designation depending on which tube element…
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Operating tubes in an audio power amplifier, the hot cathodes emitting their distinctive red-orange glow
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resistors or inductors) that would be included in series with the C and B voltage sources.
US WWV radio station signal generator using vacuum tubes, 1943