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ID = 46390
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Power/Output 
Identical to DFA9

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.6 Ampere / Direct / Battery =

"For use as Power amplifier for operation of the largest speakers, or as a low power transmitting valve." Mullard.

Va < 250; Ra 2000 ohms; 2.5mA/V

DFA series = Dull Filament Amplifying

Information source - - Manufacturers Literature   Advertisement Jan 1930

b4_base_pins~~95.png DFA9: Fin Stewart
Fin Stewart

Just Qvigstad
DFA9: Experimental Wireless Dez 1929
Gerhard Eisenbarth



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