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

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

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