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ID = 28829
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Transmitting Triode, air cooled 
Identical to T1 = NT1
Similar Tubes
Normally replaceable-slightly different:
First year 1917 Saga of the Vacuum Tube, Tyne page 230

Base Wires only
Filament Vf 13.2 Volts / If 4.2 Ampere / Direct
Description This was one of the initial group of high-power valves from MoV which were designed in conjunction with the Admiralty Signal School.

150 Watt at 1500 Volt.

An example was exhibited by MOV at the Physical Society, London in 1920.
The filament rating then stated was 12V at 4A. 
Text in other languages (may differ)

Information source Saga of the Vacuum Tube, Tyne   page 228-230
British Radio Valves - The Vintage Years, Thrower   

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