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DF_ORA

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ID = 28511
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
Identical to DF_ORA = DF-ORA
First year 1924 Saga of the Vacuumtube, Tyne Seite 378
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower p.55

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 3 Volts / If 0.06 Ampere
 

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