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1R1

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ID = 17918
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Current Regulator, Iron in Hydrogen 
Identical to 1R1

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=U)
Filament
Information source Taschenbuch zum Röhren-Codex 1948/49   

578.png 1R1: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
Usage in Models 20= 1936

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):20
 

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