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ID = 36513
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to NT3 = T3 = CV1292

Base Wires only.
Filament Vf 17.5 Volts / If 5.4 Ampere
Description 350 W at 5000 V. First high vacuum power valve.
This is the Naval name for the T3 by Osram at the Osram-Robertson lamp works. 
Information source Saga of the Vacuum Tube, Tyne   page 228-230
British Radio Valves - The Vintage Years, Thrower   

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