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1B7

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ID = 8533
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  HEPTODE 
Identical to 1B7

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=UT)
Filament Vf 1.4 Volts / If 0.1 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   

1b7.png
1B7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

413_1.png 1B7: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
1b7_spec.png
1B7: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector

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Usage in Models 7= 1939 ; 2= 1940?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):9
 

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