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ID = 28833
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to T4A
First year 1918 Saga of the Vacuum Tube, Tyne page 230

Base Wires Wires only.
Was used by Military and/or Government
Filament Vf 17.5 Volts / If 5.2 Ampere / Direct / Specified voltage AC/DC

GEC-Osram design for Navy. 450 Watt at 3-7 kV. First made by Osram lamp Works March 1918

In a 1920 exhibition of their tubes, MOV give the heater rating as 1V at 3.4A.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
175 x 330 x mm / 6.89 x 12.99 x inch
Information source Saga of the Vacuum Tube, Tyne   page 228-230
British Radio Valves - The Vintage Years: 1904-1925   Pages 128 & 130



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