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ID = 13846
Brand: Mars (tubes), Radioelektra; Praha
Tube type:  Triode, vacuum   Universal 
Identical to BS

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 3.3 Volts / If 0.68 Ampere / Direct / Battery =

Daten Röhren-Codex: Uf: 4 V; If: 0,06 A

Information source Taschenbuch zum Röhren-Codex 1948/49   

b4_base_pins~~803.png BS: Fin Stewart
Fin Stewart

Just Qvigstad
BS: Manufacturer's Literature
Anonymous 15 Collector

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