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ID = 84951
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to E507
Similar Tubes
Normally replaceable-slightly different:
  E444 ; HL2

Base Europe 4-Pin B4 + side contact
Was used by Prototype only, no series built
Filament Vf 1 Volts / If 0.1 Ampere / Direct

Experimental HL2. 1 volt valve; M = 50 as E444. Developed at the Hirst Research Centre of GEC.

Information source -- Collector info (Sammler)   Undated list of experimental MOV tubes.

b4_base_pins~~520.png E507: Fin Stewart
Fin Stewart

Just Qvigstad

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