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7A7

Information - Help 
ID = 2724
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to 7A7 = 7A7E = CV877
Similar Tubes
Other shape (e.g. bulb type):
  7A7LM
Heater different:
  14A7
Other base:
  6BD6 ; 6SK7 ; 6SK7GT
First Source (s)
09.Dec.1938 : Electron Tube Registration List
Predecessor Tubes 6K7G   6K7GT   6SK7   6SK7GT  
Successor Tubes 6BA6   6BJ6   6BD6  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC /
Tube prices 2 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

  7a7.png
  7A7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7a7_1~~1.jpg
7A7: Sammlung PR
Peter Roggenhofer

 
358.png
7A7: Telefunken Werkstattbuch
Wolfgang Bauer

 
7a7_techdat01.png
7A7: Sylvania Technical Manual
Peter Hoddow


Usage in Models 4= 1936 ; 1= 1938 ; 2= 1939?? ; 14= 1939 ; 4= 1940?? ; 2= 1940? ; 31= 1940 ; 3= 1941?? ; 1= 1941? ; 65= 1941 ; 4= 1942?? ; 7= 1942? ; 14= 1942 ; 2= 1943? ; 1= 1945?? ; 4= 1946?? ; 13= 1946? ; 22= 1946 ; 5= 1947?? ; 10= 1947? ; 36= 1947 ; 10= 1948?? ; 14= 1948? ; 67= 1948 ; 2= 1949?? ; 20= 1949? ; 26= 1949 ; 7= 1950?? ; 7= 1950? ; 2= 1950 ; 11= 1951?? ; 2= 1951? ; 1= 1951 ; 3= 1952?? ; 5= 1952? ; 1= 1952 ; 2= 1959?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):425


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