Antique radios, Old Time Radios
DFA7
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Country:
Great Britain (UK)
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| Identical to |
DFA7
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 5 Volts / If 0.85 Ampere / Direct / Specified voltage AC/DC |
| 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
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| Information source |
- - Manufacturers Literature Advertisement May 1930
History of the British Radio Valve to 1940 Page 165
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DFA7: Fin Stewart
Fin Stewart
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
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