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A battery

noun Electronics.

an electric battery for heating the filament or cathode heater of an electron tube.

Compare B battery, C battery.

Origin of A battery

First recorded in 1920–25

Example sentences from the Web for a battery

We shall call the battery which heats the filament the “filament battery” or sometimes the “A-battery.”

Letters of a Radio-Engineer to His Son |John Mills
To do so connect the grid as in Fig. 115 to the positive terminal of the A-battery.

Letters of a Radio-Engineer to His Son |John Mills