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ID = 28954
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 211A = CW-1818 = VT-4 = G_Western
Similar Tubes
Normally replaceable-slightly different:
  211 ; CV25 ; VT-4A
First year 1921 Saga of the Vacuum Tube, Tyne page 287, 288
Predecessor Tubes G_Western  
Successor Tubes 1924   242A   211D  

Base Jumbo 4-pin bayonet (1918)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.2 Ampere / Direct

According to Tyne, for this tube five selections of filament voltages were available for operation from constant voltage sources: a suffix from A to E was etched on the glass after the serial number. The filament selection was no longer required in the successor tube, the 211D, introduced in the mid 1924.
4-pin jumbo base.

Information source Saga of the Vacuum Tube, Tyne   p. 287 & 288
Tube Lore (II)   p. 234

211A: Electrical Communication No.3 Vol.2 (Januar 1924)
Georg Richter

vt4c_14.png 211A: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
211A: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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