Vacuum tube battery (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Vacuum tube battery" in English language version.

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1classicradioshop.info

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1antiquewireless.org

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antiquewireless.org

"The Mallory Bias Cell" (PDF). Retrieved August 2, 2020.

classicradioshop.info

A relatively modern grid bias battery manufactured for school science use. Although claimed as a 1940 battery, the design of the logo the battery colour and the battery type puts this as post 1975, many decades after they ceased to be used for grid biasing. Prior to 1975 they were designated as type 'Winner' and were dark blue in colour with a more complex logo.