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B420

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ID = 7607
       
Country:
France
Brand: Cyrnos (brand) - see also MCB
Tube type:  High-vacuum Rectifier   Power-supply 
Identical to B420
Similar Tubes
Normally replaceable-slightly different:
  1801
First Source (s)
Aug.1930 : Philips Bulletin R1164, p. 23

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.5 Ampere / Direct
Information source Röhren-Vademecum; P.H. Brans; Antwerpen   p. 14
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 21, p. 19
Taschenbuch zum Röhren-Codex 1948/49
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren

17_52~~3.png B420: Fin Stewart
Fin Stewart


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