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7A4

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ID = 3559
       
Country:
United States of America (USA)
Brand:
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 / Specified voltage AND current AC/DC
Description = 1 unit of 7N7 
Text in other languages (may differ)
Tube prices 3 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
7a4.png
7A4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector
319.png 7A4: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		7a4_techdat01.png
7A4: Sylvania Technical Manual
Peter Hoddow
More ...
Usage in Models 6= 1939 ; 1= 1940?? ; 12= 1940 ; 1= 1941? ; 29= 1941 ; 7= 1942 ; 1= 1946?? ; 7= 1946 ; 1= 1947? ; 8= 1947 ; 8= 1948? ; 36= 1948 ; 1= 1949? ; 4= 1949 ; 7= 1951?? ; 2= 1952?? ; 1= 1953?? ; 1= 1955??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):133

Collection of

Tomasz Szczesniak (PL)
David Erali (USA)
Aldo Patriarca (CH)
Peter Pfeiffer (D)
Collection of a member from FIN
Collection of a member from D
Werner Schaffner (CH)
Robert Gillespie (USA)
Wolfram Zylka (D)
 
7a4_pic2.jpg

7A4
 
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