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ID = 86176
Great Britain (UK)
Brand: HMV (Brand), His Masters Voice, The Gramophone Company Ltd.; Middlesex
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to S70
Similar Tubes
Normally replaceable-slightly different:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 0.6 Ampere / Direct
Information source British Radio Valves - The Classic Years: 1926-1946   p. 144

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