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7A7

Information - Help 
ID = 2724
       
Country:
United States of America (USA)
Brand:
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 / Specified voltage AND current AC/DC
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
7a7.png
7A7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector
358.png 7A7: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		7a7_techdat01.png
7A7: Sylvania Technical Manual
Peter Hoddow
More ...
Usage in Models 3= 1936 ; 1= 1938 ; 2= 1939?? ; 14= 1939 ; 5= 1940?? ; 2= 1940? ; 31= 1940 ; 3= 1941?? ; 2= 1941? ; 66= 1941 ; 4= 1942?? ; 14= 1942? ; 14= 1942 ; 2= 1943? ; 1= 1945?? ; 1= 1945? ; 1= 1945 ; 4= 1946?? ; 13= 1946? ; 27= 1946 ; 6= 1947?? ; 10= 1947? ; 50= 1947 ; 3= 1948?? ; 15= 1948? ; 73= 1948 ; 2= 1949?? ; 21= 1949? ; 26= 1949 ; 8= 1950?? ; 8= 1950? ; 2= 1950 ; 11= 1951?? ; 3= 1951? ; 1= 1951 ; 2= 1952?? ; 3= 1952? ; 3= 1952 ; 2= 1953 ; 1= 1958?? ; 2= 1959?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):462

Collection of

Karl - Heinz Bossan (D)
Christian Schaufelberger (CH)
Collection of a member from FIN
Michael Gnaedig-Fischer (MEX)
Jozef Brughmans † (B)
George Papaiz (CDN)
David Erali (USA)
Georges Werts (B)
Tomasz Szczesniak (PL)
Aldo Patriarca (CH)
Tor Steinnes (N)
Raynal Aufils (F)
Hermann Fleischanderl (A)
Peter Pfeiffer (D)
Bruno Candreia (CH)
Museum Roggenhofer (A)
 
7a7_1~~1.jpg

7A7
 
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