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ID = 28449
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Triode, vacuum 
Identical to CW-186 = 201A_Western
Similar Tubes
Other base:
First year 1917 ?? Saga of the Vacuum Tube, Tyne Seite 101

Base SPECIAL TUBEBASE in general
Was used by Military and/or Government
Filament If 1.3 Ampere / Direct / Battery =
Description Special 3 pin base, Navy specified, using also the bayonet pin. S-19 tennis-ball bulb.
Gain 37 to 44, 2.6 to 3 volts filament.
Unrelated to UX-201A 
Information source Saga of the Vacuum Tube, Tyne   

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