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ID = 17266
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Transmitting Triode, air cooled 
Identical to RK38 = CV2591
Similar Tubes
Other characteristic (electr. data):

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bt)
Filament Vf 5 Volts / If 8 Ampere / Direct
Description 100W anode dissipation, tantalum plate and grid, hard glass bulb, isolantite ceramic base. Similar to RK36 with mu raised to 30. 60MHz full ratings. Plate shows a yellowish-red color (900 Degrees Centigrade or 1650 F) when operated at maximum ratings. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Tube Lore (I)
RK38: Ebay item 383681843215
Robert Gillespie

RK38: ARRL Handbook 1972
Michael Schlör

RK38: Handbook Raytheon amateur tubes
Miguel Angel Trujillo-Rodriguez

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