an electric battery for heating the filament or cathode heater of an electron tube.
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Question 1 of 7
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Origin of A battery
First recorded in 1920–25
Words nearby A battery
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
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.”
To do so connect the grid as in Fig. 115 to the positive terminal of the A-battery.