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7X7

Information - Help 
ID = 13368
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Diode-Triode   Detector 
Identical to 7X7 = XXFM = 7X7/XXFM
Similar Tubes
Heater different:
  14X7
First Source (s)
30.Oct.1944 : Electron Tube Registration List

Base Loctal-8, B8G (Sylvania, 1938) (Codex=We)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Tube prices 2 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

7x7.png
7X7: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector

581.png 7X7: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
7x7_rca_data_01.png
7X7: RCA
Dietrich Grötzer

More ...
Usage in Models 3= 1946 ; 3= 1948 ; 3= 1949 ; 1= 1950? ; 1= 1950 ; 1= 1951

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):12

Collection of

 
7x7sylvania_klein.jpg

7X7
 

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