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ID = 13507
United States of America (USA)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 212D = CW-1819B
Similar Tubes
Normally replaceable-slightly different:
  4212D ; CV200 ; MZ2-200
Other base and data slightly different:
First year 1919 ? Vintage Radio 1887-1929, Greenwood's Classic Picto
Predecessor Tubes 212A  
Successor Tubes 312E  

Base Large 4 pin Bayonet (Codex=Eo)
Was used by Transmittertube (Radio)
Filament Vf 14 Volts / If 4 Ampere / Direct / Specified voltage AC/DC

250 Watt TX tube.
According to Tyne, 212D replaced 212A in 1924.

Dimensions (WHD)
incl. pins / tip
x 345 x 92 mm / x 13.58 x 3.62 inch
Weight 744 g / 26.24 oz
Information source Taschenbuch zum Röhren-Codex 1951   
Saga of the Vacuum Tube, Tyne   p. 290, 291

212_10.png 212D
Emilio Ciardiello



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