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ID = 28856
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 212D_Western = CW-1819B
Similar Tubes
Normally replaceable-slightly different:
  4212D ; CV200 ; MZ2-200
First year 1919 ? Vintage Radio 1887-1929, Greenwood's Classic Pictorial Album
Predecessor Tubes 212A  
Successor Tubes 312E  

Filament Vf 14 Volts / If 4 Ampere / Direct
Description 250 Watt TX tube.
According to Tyne, 212D replaced 212A in 1924. 
Literature Saga of the Vacuumtube, Tyne   
212D_Western: aus ebay, Verkäufer uncle-papa
Gottfried Silberhorn

Emilio Ciardiello


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