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ID = 7257
Brand: Cyrnos (brand) - see also MCB
Tube type:  LOCKED OFF TUBE (CODE 9) - see in Notes   Power-supply 
Identical to 4V = Valve4V

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.75 Ampere / Direct

Heizstrom 0,3 A aus Röhrencodex widerspricht dem Herstellerprospekt 0,75 A.

Siehe Valve4V

Literature Taschenbuch zum Röhren-Codex 1948/49   

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