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ID = 68352
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transmitting Triode, air cooled   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to DO40

Base L4 British large 4 pin (1922, LG4)
Was used by Transmittertube (Radio)
Filament Vf 6 Volts / If 2 Ampere / Direct / Specified voltage AC/DC

Mentioned on advertisement by Mullard, April 1932.

Dimensions (WHD)
incl. pins / tip
78 x 172 x mm / 3.07 x 6.77 x inch
Information source -- Original prospect or advert   Advertisement November 1930
British Radio Valves - The Vintage Years: 1904-1925   Page 129

l4_based_triode~~1.png DO40: Peter den Boer
Fin Stewart

Just Qvigstad

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