General purpose triode with a filament designed to be operated from a pair of dry cells. The filament was rated at 2.5 to 3 volts with a current of 60 mA. Released in 1923.
Marketed as: "Ediswan low temperature valve"
Manufacturer: Edison Swan Electric Co., England

Physical Description

Tubular glass bulb with top exhaust tip with 4 pin American (UV) style base with brass base shell.

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