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ID = 16317
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Transmitting Triode, air cooled 
Identical to RK51
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Br) Top contact with a cap.
Filament Vf 7.5 Volts / If 3.75 Ampere / Direct
Description Thoriated tungsten filament, carbon plate, hard glass bulb over ceramic base. 60W plate dissipation; full ratings operation up to 60MHz. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Tube Lore (I)
RK51: Paul Cornelissen
Paul Cornelissen

RK51: ARRL Handbook 1972
Michael Schlör

RK51: Handbook Raytheon amateur tubes
Miguel Angel Trujillo-Rodriguez

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