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ID = 20181
Tube type:  TRIODE (Detail uncertain) 
Identical to U30_Ultra

Filament Vf 2.3 Volts / If 0.8 Ampere
Description Gasgleichrichter. Diese Röhre gab es auch mit Uf:2.7 und If:0.3 
Information source - - -   
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U30_Ultra: H.Wigge, Rundfunktechnisches Handbuch, 1.Teil, 1925, S.174
Anonymous 15 Collector

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