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ID = 30750
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to T3_Osram
First year Feb.1917 British Radio Valves - The Vintage Years, Thrower

Base Wires Wires only
Was used by Military and/or Government
Filament Vf 17.5 Volts / If 5.4 Ampere / Direct / Parallel, (AC/DC)

350 W at 5000 V.

One of the first group of high vacuum power valves developed by the UK Navy's Signal Reserach Group. Known by the British Navy as NT3. First made by Osram Lamp Works February 1917.
At an exhibition in London in 1920, the heater rating was given as 18V, 3.4A and an output power of 330W. (Vyse & Jessop). Normally made with wires - two at one end for the filament and one at the other ensd for the anode. The grid was connected to a cap on the side of the tube. Also made with bayonet B22 base at each end - extremely rare.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 305 x 150 mm / x 12.01 x 5.91 inch
Weight 431 g / 15.20 oz
Information source Saga of the Vacuum Tube, Tyne   page 228-230
British Radio Valves - The Vintage Years, Thrower   
T3_Osram: Fin Stewart collection
Fin Stewart


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