General purpose triode with filament designed for operation from a single dry cell. The same as the Western Electric 215A. 1.0 volt directly heated cathode. This valve was also made and sold by STC with the type number 4215A or 125A.

Physical Description

Tubular glass bulb with top exhaust tip and small 4 contact bayonet style moulded base. Mounted on a display block with another example with its bulb removed.

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