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ID = 35388
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Transmitting Tetrode, air cooled 
Identical to 278A
Similar Tubes
Normally replaceable-slightly different:

Filament Vf 10 Volts / If 16 Ampere / Direct
Description Tetrode variant of 251A. Thoriated tungsten filament. 1KW plate dissipation; 30MHz operation. Three pin base. 
Information source Tube Lore (I)   


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