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ID = 28957
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  High-vacuum Rectifier   Power-supply 
Identical to 214A
First year 1922 Saga of the Vacuum Tube, Tyne page 291
Successor Tubes 1926   214D  

Base Jumbo 4-pin bayonet (1918)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.25 Ampere / Direct

Essentially the 211A with the grid omitted and reduced filament-anode spacing.

Information source Saga of the Vacuum Tube, Tyne   p. 291
Tube Lore (II)   p. 234-235

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