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ID = 30557
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Triode, vacuum   Universal 
Identical to 203A_UV4 = CW-933 = J_Western = VT-1

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Filament Direct / Battery =

This tube, from WWI, had "iron-clad" electrode structure, with grid punched from nickel sheet, plate ribbed for rigidity and CuNiFe alloy filament.
Also known as VT-1, Signal Corps, or CW-933, U.S. Navy coding.

Information source Saga of the Vacuum Tube, Tyne   p.99
Tube Lore (I)   Supplement S9
203A_UV4: Own collection
Valery Gromov

203A_UV4: Fin Stewart
Fin Stewart


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