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ID = 28510
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Power/Output 
Identical to DFA1
First year 1924 Saga of the Vacuum Tube, Tyne Seite 378
First Source (s)
1924 : Saga of the Vacuum Tube, Tyne

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5.5 Volts / If 0.2 Ampere / Direct / Battery =
Description Low consumption loud speaker valve. 
Literature Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
DFA1: Ebay item 111172938618
Clive Forder

DFA1: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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