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ID = 46504
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to D040

Base L4 British large 4 pin (1922, LG4)
Was used by Transmittertube (Radio)

Mentioned on advertisement by Mullard, April 1932. 1kw 40 watt transmitting tube

See also DO40 which is the correct name for this valve.

Dimensions (WHD)
incl. pins / tip
78 x 172 x mm / 3.07 x 6.77 x inch
Information source - - Manufacturers Literature   
British Radio Valves - The Vintage Years: 1904-1925   Page129

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