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4H

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ID = 22887
       
Country:
Austria
Brand: AKA; Austria (tubes)
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 4H
Similar Tubes
Normally replaceable-slightly different:
  B442

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct
Information source Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren   


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