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ID = 46495
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Power/Output 
Identical to PM256A
First year Jun.1930 Experimental Wireless & Wireless Engineer Mullard Advertisement June 1930
First Source (s)
1930 : History of the British Radio Valve to 1940 p. 165

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.25 Ampere / Direct / Battery =

Va <200; Ra 1,400 ohms gm 2.6mA/V at Va=100 and Vg=0

Information source - - Manufacturers Literature   Advertisement June 1930
Babani, International Radio Tube Encyclopaedia   p. 130 & 131

b4_base_pins~~415.png PM256A: Fin Stewart
Fin Stewart

Just Qvigstad


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