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ID = 31871
United States of America (USA)
Brand: Amperex; New York
Tube type:  Transmitting Triode, air cooled 
Identical to 8078 = TB4/1500

Was used by Industrial
Filament Vf 5 Volts / If 32.5 Ampere / Direct

US registered code for Philips TB4/1500 power triode for industrial heating.

Information source - - Manufacturers Literature   
8078: Valvo Spezialröhren 1972
Anonymous 10 Collector


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