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ID = 28955
United States of America (USA)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Transmitting Triode, air cooled   Universal 
  <1925 rare.
Identical to 211D = CW-1818A
Similar Tubes
Normally replaceable-slightly different:
  211 ; 211E ; 4211D ; D-80050 ; HF140 ; HF240 ; UV211
Other characteristic (electr. data):
First year 1924 Saga of the Vacuum Tube, Tyne page 288, 289
Predecessor Tubes 211A  
Successor Tubes D-86737  

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

Convection cooled 100 Watt max anode dissipation; thoriated-tungsten filament. Mu 12. Uses include AF power amplifiers or modulators, class B RF amplifiers, class C RF amplifiers or oscillators.
Also made by Amperex.

Dimensions (WHD)
incl. pins / tip
x 184 x 51 mm / x 7.24 x 2.01 inch
Weight 180 g / 6.35 oz
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   
- - Manufacturers Literature   
Tube Lore (I)
Tube Lore (II)

vt4c_3.png 211D: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
211D: Manufacturer's Literature
Emilio Ciardiello

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