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

Base Europe 4-Pin B4 + side contact (Codex=Eu) Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =

Das ist keine Röhre der "Gemeinschaftsbezeichnung", also nicht verwandt mit AB1 oder AB2.

Information source Taschenbuch zum Röhren-Codex 1948/49   
AB4: rtt
Michael Schlör


from Just Qvigstad

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