The first indirectly heated tetrode (screen grid) valve to be made by RCA. Replaced by the faster warm-up type UY224A at the end of 1930.
2.5 V indirectly heated cathode.

Manufactured by Radio Corporation of America, Harrison, New Jersey, U.S.A.

Physical Description

Conical glass bulb on five pin UY style base with top cap missing..

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