Summary

Tetrode type UX222, the first type of screen grid (tetrode) valve introduced by RCA in 1927. This valve is the Sylvania equivalent. Used as a Class A R. F. amplifier.
Manufacturer: Sylvania Products Co., Emporium, PA, USA.
3.3 V directly heated cathode.

Physical Description

Conical bulb with 4 pin UX style base with top cap. Mounted on display block with ST 18226.

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