B battery

nounElectronics.

an electric battery for supplying a constant, positive voltage to the plate of a vacuum tube.

Origin of B battery

First recorded in 1920–25

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Worst of all, if you accidentally reversed the A and B battery connectors, you could fry your radio's precious tubes.
Whatever Happened to the "B" Battery? | Megan McArdle | December 21, 2012 | THE DAILY BEAST
When the B battery is connected, it puts a positive charge on the plate of the tube.
Whatever Happened to the "B" Battery? | Megan McArdle | December 21, 2012 | THE DAILY BEAST
The negative terminal of the B-battery is connected to the filament.
Letters of a Radio-Engineer to His Son | John Mills
Now, suppose that the B-battery takes away 100 of these each second.
Letters of a Radio-Engineer to His Son | John Mills
Of course, as long as the switch in the B-battery is open no current can flow.
Letters of a Radio-Engineer to His Son | John Mills

The B-battery will want to take in electrons at its positive terminal and to send them out at its negative terminal.
Letters of a Radio-Engineer to His Son | John Mills
In the plate-filament circuit we connect the B-battery and a switch, S, and another coil.
Letters of a Radio-Engineer to His Son | John Mills

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