Antique radios, Old Time Radios
DFA9
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Country:
Great Britain (UK)
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| Identical to |
DFA9
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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 6 Volts / If 0.6 Ampere / Direct / Battery = |
| Description |
"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
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| Information source |
- - Manufacturers Literature Advertisement Jan 1930
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DFA9: Fin Stewart
Fin Stewart
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Just Qvigstad
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DFA9: Experimental Wireless Dez 1929
Gerhard Eisenbarth
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