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DFA7

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ID = 46494
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Power/Output 
Identical to DFA7

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.85 Ampere / Direct / Battery =
Description "Similar to the DFA6 but with a larger AC output. It may also be used as a transmitter or modulator in telephony transmitters, with voltages up to 400 on the anode dissipating not more than 10 watts." Mullard.

Va < 400; Ra 2850 ohms, 0.85mA/V at Va=100 and Vg=0

Filament current of 0.85 is a maximum figure. DFA series = Dull Filament Amplifying 

Literature - - Manufacturers Literature   Advertisement May 1930
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Usage in Models 1= 1929

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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