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Duotron4A

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ID = 52626
       
Country:
Germany
Brand: Radioröhren-Laboratorium-GmbH, Gerd Nickel, (Ultra); Berlin
Developer: Radioröhren-Laboratorium-GmbH, Gerd Nickel, (Ultra); Berlin 
Tube type:  Double Triode 
  Ca. 1925 up to 1945 rare.
Identical to Duotron4A
Base SPECIAL TUBEBASE in general
Filament Vf 3.5 Volts / If 0.14 Ampere / Direct / Battery =
Description This is a gaseous double triode. The first triode is a HF triode, the second triode is a detector. 
Information source - - Manufacturers Literature   
duotronsockel_1.png Duotron4A
Peter den Boer
duotron2a4adata1_1.png
Duotron4A: own collection
Peter den Boer
More ...
Usage in Models 1= 1927
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
 
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