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7A4

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ID = 3559
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Triode, vacuum   Universal 
Identical to 7A4 = VT-192 = CV1770
Similar Tubes
Other class quality (otherwise equal):
  XXL
Heater different:
  14A4
Other base:
  6J5GT
First Source (s)
08.Mar.1939 : Electron Tube Registration List
Predecessor Tubes 6J5G   6J5   6P5G   6P5GT  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC /
Description = 1 unit of 7N7 
Text in other languages (may differ)
Tube prices 3 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

  7a4.png
  7A4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7a4_pic2.jpg
7A4: o
Anonymous 15 Collector

 
319.png
7A4: Telefunken Werkstattbuch
Wolfgang Bauer

 
7a4_techdat01.png
7A4: Sylvania Technical Manual
Peter Hoddow


Usage in Models 6= 1939 ; 12= 1940 ; 1= 1941? ; 28= 1941 ; 7= 1942 ; 1= 1946?? ; 7= 1946 ; 1= 1947? ; 7= 1947 ; 8= 1948? ; 34= 1948 ; 4= 1949 ; 7= 1951?? ; 2= 1952?? ; 1= 1955??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):126

Collection of a member from D
Collection of a member from FIN

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