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ID = 28927
Brand: Nowak & Co.; Wien
Tube type:  Triode, vacuum   Universal 
Identical to IIIa
First year 1927 Saga of the Vacuum Tube, Tyne page 463

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 1.6 Volts / If 0.06 Ampere / Direct / Battery =
Information source Bastelbriefe der Drahtlosen   1927, H.8
IIIa: WEKA-Katalog 1927
Gerhard Heigl

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