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ID = 28571
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   Universal 
  <1925 very rare. ***
Identical to G_Western = 211A = CW-1818 = VT-4
First year 1920 ?? Saga of the Vacuum Tube, Tyne page 280, 287
Successor Tubes 211A  

Base Jumbo 4-pin bayonet
Was used by Military and/or Government
Filament Vf 10 Volts / If 3 Ampere / Direct / Parallel / series AC/DC

The type G went through various structural changes before it was project coding for the 211 series, the first one being the 211A

Dimensions (WHD)
incl. pins / tip
x 184 x 51 mm / x 7.24 x 2.01 inch
Weight 180 g / 6.35 oz
Information source Saga of the Vacuum Tube, Tyne   Page 287

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