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ID = 28832
Tube type:  Transmitting Triode, air cooled 
Identical to T4
First year 1918 Saga of the Vacuumtube, Tyne page 230

Filament Vf 17.5 Volts / If 5.2 Ampere
Description GEC-Osram design for Navy. 450 Watt at 3-7 kV. 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   page 228-230
British Radio Valves - The Vintage Years, Thrower   

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