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12SQ7 Info
Country:  United States of America (USA)      Brand:  Common type USA 
  Tube type:  Double Diode-Triode   Audio Frequency 
Tube ID = 2638
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Identical to 12SQ7 = VT-104
Similar Tubes 12SQ7GT (other shape (e.g. bulb, size))   6SQ7 (Heater different)   CV546 (Multiple differences or of other kind)  
First Series   1939 -- Collector info (Sammler)
First Source (s) Feb.1939 : Electron Tube Registration List
Predecessor Tubes 12Q7G   12Q7GT  
Successor Tubes 12AT6  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vk)
Was used by Radio/TV-reception etc.
Filament Vf 12.6 Volts / If: 0.15 Ampere / -: Indirect / -: Series, AC/DC /
Tube prices 0 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

  12sq7.gif
  Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus
12sq7_kr.jpg
Private collection
Emilio Ciardiello

 
334_3.png
Telefunken Werkstattbuch
Wolfgang Bauer

 
12sq7_techdat01.png
SEL Handbuch 1964
Peter Hoddow

Usage in Models (calculation each 25th of the month)   1= 1933 ; 1= 1934?? ; 1= 1934 ; 2= 1938? ; 2= 1938 ; 11= 1939?? ; 49= 1939? ; 167= 1939 ; 33= 1940?? ; 56= 1940? ; 171= 1940 ; 94= 1941?? ; 80= 1941? ; 198= 1941 ; 57= 1942?? ; 4= 1942? ; 87= 1942 ; 3= 1943? ; 1= 1943 ; 5= 1945?? ; 11= 1945? ; 25= 1945 ; 55= 1946?? ; 76= 1946? ; 349= 1946 ; 58= 1947?? ; 15= 1947? ; 193= 1947 ; 40= 1948?? ; 17= 1948? ; 234= 1948 ; 57= 1949?? ; 45= 1949? ; 105= 1949 ; 34= 1950?? ; 29= 1950? ;
Number of Models with this tube   2798
No further Information for

12SQ7    

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