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ID = 33977
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: National Electronics, Inc.; Geneva, IL 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 7018 = 615 = NL-615

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial
Filament Vf 2.5 Volts / If 7 Ampere / Direct

Half-wave mercury rectifier intended for operation in industrial power supplies up to 600 VDC.

2000V PIV, 2.5A average current, 12V typical voltage drop at 8A peak.

Information source - - Manufacturers Literature   
7018: Manufacturer's Literature
Emilio Ciardiello


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