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7A8

Information - Help 
ID = 2725
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  OCTODE   Frequency converter 
Identical to 7A8 = CV878
First Source (s)
10.Jun.1938 : Electron Tube Registration List
Predecessor Tubes 6D8G  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Weo)
Filament Vf 6.3 Volts / If 0.15 Ampere / Indirect / Parallel / series AC/DC
Tube prices 4 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  7a8.png
  7A8: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7a8~~1.jpg
7A8: 1938
Tor Steinnes

 
562.png
7A8: Telefunken Werkstattbuch
Wolfgang Bauer

 
7a8_techdat01.png
7A8: Sylvania Technical Manual
Peter Hoddow


Usage in Models 13= 1938 ; 1= 1939?? ; 70= 1939 ; 1= 1940? ; 30= 1940 ; 1= 1941?? ; 37= 1941 ; 3= 1942? ; 3= 1942 ; 1= 1944 ; 1= 1945? ; 2= 1945 ; 1= 1946?? ; 1= 1946? ; 23= 1946 ; 2= 1947?? ; 3= 1947? ; 9= 1947 ; 1= 1948?? ; 26= 1948 ; 14= 1949 ; 6= 1950?? ; 17= 1950 ; 3= 1951? ; 40= 1951 ; 2= 1952?? ; 1= 1952? ; 6= 1952 ; 2= 1953?? ; 3= 1953 ; 1= 1954? ; 6= 1954 ; 1= 1960?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):331


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