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7J7

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ID = 2729
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Philco, Philadelphia Stg. Batt. Co.; USA 
Tube type:  Triode-Heptode   Frequency converter 
Identical to 7J7 = VT-194 = CV897
Similar Tubes
Heater different:
  14J7
Other base:
  6J8G
First Source (s)
05.Jun.1942 : Electron Tube Registration List 202
12.Jul.1939 : Electron Tube Registration List
Predecessor Tubes 7J7E  
Successor Tubes 7S7  
Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wfo)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description

First registered in 1939 as triode-hexode, was re-registered to Sylvania Hygrade in June 1942, with the addition of a suppressor grid internally connected to cathode.
See also 7J7E.

 
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature
7j7.png
7J7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector
415_1.png 7J7: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		7j7_techdat01.png
7J7: Sylvania Technical Manual
Peter Hoddow
More ...
Usage in Models 3= 1939? ; 11= 1939 ; 1= 1940?? ; 2= 1940? ; 9= 1940 ; 2= 1941? ; 20= 1941 ; 2= 1942?? ; 7= 1942? ; 1= 1942 ; 1= 1943? ; 1= 1945? ; 3= 1945 ; 1= 1946?? ; 2= 1946? ; 5= 1946 ; 2= 1947 ; 6= 1948 ; 1= 1949? ; 2= 1949
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):82

Collection of

Michael Gnaedig-Fischer (MEX)
Collection of a member from FIN
David Erali (USA)
Christian Schaufelberger (CH)
Tor Steinnes (N)
Geri Meier (CH)
Otto Frosinn (D)
Museum Roggenhofer (A)
 
7j7_2.jpg

7J7
 
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