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7Q7

Information - Help 
ID = 4033
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Pentagrid-Converter (Heptode)   Pentagrid (new) 
Identical to 7Q7 = CV899
Similar Tubes
Heater different:
  14Q7
Other base:
  6SA7GT
First Source (s)
21.Aug.1939 : Electron Tube Registration List
Predecessor Tubes 7B8   6SA7GT   6A8GT  
Successor Tubes 6BE6  
Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wd)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC
Tube prices 3 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  7q7.png
  7Q7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
sylvania_7q7_top.jpg
7Q7: From own collection
David Erali
 
411.png
7Q7: Telefunken Werkstattbuch
Wolfgang Bauer
 
7q7_techdat01.png
7Q7: Sylvania Technical Manual
Peter Hoddow

from Just Qvigstad
Usage in Models 2= 1940?? ; 1= 1940 ; 1= 1941? ; 5= 1941 ; 9= 1942? ; 13= 1942 ; 1= 1944 ; 1= 1946?? ; 9= 1946? ; 10= 1946 ; 9= 1947?? ; 6= 1947? ; 17= 1947 ; 3= 1948?? ; 10= 1948? ; 42= 1948 ; 4= 1949?? ; 6= 1949? ; 8= 1949 ; 10= 1950?? ; 2= 1950 ; 10= 1951?? ; 1= 1951 ; 4= 1952?? ; 5= 1953??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):189
Collection of Valery Gromov (RUS)
Collection of Aldo Patriarca (CH)
Collection of Wesselin Tzenow † 25.5.10 (D)
Collection of a member from FIN
Collection of Tomasz Szczesniak (PL)
Collection of Michael Gnaedig-Fischer (MEX)
Collection of David Erali (USA)
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