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

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 20, 2012

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 20, 2012

historical examples

the potentiometer must never be shunted around the b battery or the latter will soon run down.
the radio amateur’s hand book a. frederick collins

“if you follow the yellow wire you’ll come to b battery,” said wilde.
pushed and the return push george herbert fosdike nichols, (aka quex)

the 8-inch sh-ll had made very short work of b battery’s mess.
pushed and the return push george herbert fosdike nichols, (aka quex)

weve got too high a voltage on the b battery, said bob, after a moment of study.
the radio boys at mountain p-ss allen chapman

in using either of these heterodyne receivers be sure to carefully adjust the b battery by means of the potentiometer.
the radio amateur’s hand book a. frederick collins

since the electrons do not reach the plate the current from the b battery cannot flow between it and the filament.
the radio amateur’s hand book a. frederick collins

b battery’s guns were tucked beneath some stubby full-leaved trees that would hide them from the keenest-eyed aerial observer.
pushed and the return push george herbert fosdike nichols, (aka quex)

don’t fail to adjust the b battery after putting in a fresh vacuum tube, as its sensitivity depends largely on the voltage.
the radio amateur’s hand book a. frederick collins