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ID = 71452
United States of America (USA)
Brand: National Radio Tube Company; San Francisco, CA
Developer: National Radio Tube Company; San Francisco, CA 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to R3_Rectobulb
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact screw type.
Was used by Industrial
Filament Vf 10 Volts / If 1.75 Ampere / Direct / Specified voltage AC/DC

NATIONAL RADIO TUBE CO. This tube is most satisfactory for amateur radio use. the top cap consists of a brass binding post attached to a Bakelite cap for extra strength.

Max revers voltage: 3000 V

Max current: 250 mA

Information source -- Collector info (Sammler)   

866_so~~1.png R3_Rectobulb: Fin Stewart
Fin Stewart

Just Qvigstad


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