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. The field of electronics comprises the study and use of systems that operate by controlling the flow of electrons (or other charge carriers) in devices such as thermionic valves (vacuum tubes) and semiconductors. ... This does not cite its references or sources. ... Diagram of Vacuum-Tube Diode A plate is a type of electrode that formed part of a vacuum tube. ... In electronics, a vacuum tube or (outside North America) thermionic valve or just valve, is a device generally used to amplify, switch or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ... This article or section does not cite its references or sources. ...

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)

Image File history File links Download high-resolution version (483x620, 193 KB) Other versions Originally from en. ... Image File history File links Download high-resolution version (483x620, 193 KB) Other versions Originally from en. ... Image File history File links Download high-resolution version (731x778, 22 KB) B Battery circuit of a Triode vacuum tube. ... Image File history File links Download high-resolution version (731x778, 22 KB) B Battery circuit of a Triode vacuum tube. ...

See also

• A battery (vacuum tubes)
• C battery (vacuum tubes)

In electronics, an A battery is any battery used to provide power to the filament of a vacuum tube. ... In electronics, a C battery is any battery used to provide bias to the control grid of a vacuum tube. ...

External link

• Instructions for Operating The Crosley 51 Radio Receiver Examples of usage of A, B, and C batteries in an early radio.