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ID = 19231
Brand: Niggl Hochvakuum-Röhren GmbH, München.
Tube type:  TRIODE (Detail uncertain) 
Identical to NA206
First Source (s)
Sep.1927 : Funk Bastler Heft 39

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 1.7 Volts / If 0.06 Ampere / Direct / Battery =
Description Audion, Hoch- und Niederfrequenz; Durchgriff: 14%; Steilheit: 0,4 mA/V; Innenwiderstand: 18 kOhm 
NA206: Funk-Bastler 1927, Heft 39
Hartmut Völler

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