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7R7

Information - Help 
ID = 2996
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Diode-Pentode   RF/IF-Stage   Controlling (mu) 
Identical to 7R7 = CV900
Similar Tubes
Other characteristic (electr. data):
  EBF21
Heater different:
  14R7
First Source (s)
07.Mar.1941 : Electron Tube Registration List
Predecessor Tubes 7E7   6B8GT  
Successor Tubes 6DC8  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wb)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  7r7.png
  7R7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7r7~~2.jpg
7R7: 1941
Tor Steinnes

 
390_1.png
7R7: Telefunken Werkstattbuch
Wolfgang Bauer

 
7r7.png
7R7: Sylvania Radio Tubes Technical Manual
Didier Tholomier


from Just Qvigstad

Usage in Models 2= 1942 ; 1= 1946?? ; 3= 1946 ; 1= 1947?? ; 2= 1947? ; 6= 1947 ; 8= 1948?? ; 11= 1948 ; 5= 1949 ; 3= 1950? ; 7= 1950 ; 1= 1951 ; 1= 1953??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):51


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