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AB4

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ID = 12508
       
Country:
Belgium
Brand: Adzam (tubes made by MBLE, Belgium)
Tube type:  Space Charge Tetrode 
Identical to AB4 = A441N

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eu) Sidecontact
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =
Description Das ist keine Röhre der "Gemeinschaftsbezeichnung", also nicht verwandt mit AB1 oder AB2. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
ab4_so.png
AB4: rtt
Michael Schlör

 

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