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ID = 82127
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Transmitting Triode, air cooled   Universal 
Identical to CF-340 = Oscillion_250W

Base Wires Wires only.
Was used by Military and/or Government
Filament Vf 30 Volts / If 2.4 Ampere / Direct / Battery =

This tubeis otherwise known as the de Forest 1/4 kW tube, or Oscillion_250w. Anode voltage is 1500. It was used in the de Forest 1.2 kW patrol boat and dirigible sets, as well as the de Forst 1/4kW aeroplane sets.  

Information source Saga of the Vacuum Tube, Tyne   Page 128
-- Collector info (Sammler)   Radio Test Lab, report, US Navy 3/2/1919

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