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ID = 34931
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Transmitting Triode, air cooled   Universal 
Identical to 331A = 805

Base Jumbo 4-pin bayonet Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.2 Ampere / Direct / Parallel, (AC/DC)

High-mu transmitting triode, graphite anode. 125W, 30MHz, typical mu=40; also used as class B modulator. 4-pin jumbo base.

Information source Tube Lore (I)   
331A: Worthpoint photo
Fin Stewart

331A: ARRL Handbook 1972
Michael Schlör


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