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ID = 6850
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 258B = CV2594
Similar Tubes
Other base:

Base SPECIAL TUBEBASE in general Top contact with a cap.
Filament Vf 2.5 Volts / If 7.5 Ampere / Direct
Description 7.5KV PIV, 640mA. Bi-pin version of 249B.
Amperex, Continental, Hytron, Taylor and WE known manufacturers. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Tube Lore (I)
258B: K2GLO Collection
Robert Deuel

258B: Western electric electron tubes
Miguel Angel Trujillo-Rodriguez

258B: Manufacturer's Literature
Emilio Ciardiello

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