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ID = 17027
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 851
Similar Tubes
Normally replaceable-slightly different:
  38151 ; CV2671 ; VT-41

Base Pin-and-blade jumbo (3 contacts) Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 15.5 Ampere / Direct / Parallel, (AC/DC)

T48 stepped bulb with cap; blade-and-pins base; thoriated tungsten filament. Mu 20.5, 750W, 3MHz.
Amperex, Cunningham, GE, RCA, Sylvania, United and Westinghousea among known sources.

Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   
851: Electronics, October 1933
Achim Dassow

851: Manufacturer's Literature
Emilio Ciardiello

851: RCA Technical Manual TT3
Miguel Angel Trujillo-Rodriguez

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