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ID = 28451
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 CW-1818 = 211A = VT-4 = G_Western
First year 1921 ?? Saga of the Vacuum Tube, Tyne Seite 288

Was used by Military and/or Government
Filament Vf 10 Volts / If 3.4 Ampere / Direct / Parallel / series AC/DC

This tube was designated CW-1818 by the U S Navy and was used 1918 in World War One. It was released commercially as 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   Pages 288 & 289

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