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1A7

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ID = 19219
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Pentagrid-Converter (Heptode)   Pentagrid (old)   Controlling (mu) 
Identical to 1A7
Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ut) Top contact with a cap.
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =
Description A metal tube 1A7 was never existing. Octal- battery tubes were only made as glas types (1A7G, 1A7GT). We list the 1A7 because some schematics list as 1A7. 
Text in other languages (may differ)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
valvula1a7.png
1A7: Internet
Miguel Angel Trujillo-Rodriguez
1a7_sock.png 1A7: Tabu Röhren-Codex, 1948
Anonymous 15 Collector
More ...
Just Qvigstad 		1a7_dat.png
1A7: elektron taschenbuch 1952
Heinz Höger
More ...
Usage in Models 2= 1935? ; 1= 1935 ; 1= 1939?? ; 4= 1939? ; 9= 1939 ; 9= 1940?? ; 5= 1940? ; 16= 1940 ; 8= 1941?? ; 2= 1941? ; 8= 1941 ; 7= 1942?? ; 13= 1942? ; 7= 1942 ; 1= 1945 ; 11= 1946?? ; 1= 1946? ; 14= 1946 ; 7= 1947?? ; 10= 1947 ; 6= 1948?? ; 2= 1948? ; 7= 1948 ; 4= 1949?? ; 3= 1949 ; 10= 1950?? ; 5= 1951?? ; 1= 1952?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):174

Collection of

Geri Meier (CH)
Mario Coelho (P)
 
1a7a_1.jpg

1A7
 
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