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ID = 30494
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Triode, air cooled   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to MT9L

Base Wires Sidecontact.
Was used by Telephony
Filament Vf 17 Volts / If 9.2 Ampere / Direct / Specified voltage AC/DC

This operated with a plate voltage of 2000 - 5000 but was used mainly on 4000 volts where it gave an output of 700 watts. The grid connection was a cap terminal on the side of the tube..

Dimensions (WHD)
incl. pins / tip
180 x 480 x mm / 7.09 x 18.90 x inch
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 404, p. 907 & 909
The Saga of Marconi Osram Valve   Page 125

MT9L: GEC's catalogue supplement
Anonymous 413 Collector

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