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In electronics, a B battery is any battery used to provide the plate voltage of a vacuum tube. It is sometimes colloquially referred to as a "dry battery" (although there's no reason why a "wet" battery of suitable voltage couldn't be utilised for the purpose) The term comes from the days of valve (tube) radios when it was common practice to use a dry battery for the plate (Anode) voltage and a rechargeable lead/acid "wet" battery for the filament voltage.
Even when the plate voltage rail is fed by a power supply rather than a battery, it is generally referred to as the "B+" line.
Eveready #762-S 45 Volts
Radio "B" Battery (Portable size)
L 4.125" W 2.5" H 5.75" ca. 1942
"B" Battery circuit of a Triode (white area)
- A battery (vacuum tubes)
- C battery (vacuum tubes)
- Instructions for Operating The Crosley 51 Radio Receiver Examples of usage of A, B, and C batteries in an early radio.
Categories: Electric batteries | Vacuum tubes | Battery shapes | Electronics stubs