A tetrode (screen grid valve) designed for use as a radio frequency amplifier in battery powered radios.
2 volt directly heated cathode.
The date code on the base (E 4) indicates that this valve was manufactured in November 1932.
Manufactured by: RCA Radiotron Company, Harrison, NJ, USA.

Physical Description

Conical bulb on 4 pin UX base with top cap.

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