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7B4

Information - Help 
ID = 2992
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Triode, vacuum   Audio Frequency 
Identical to 7B4
Similar Tubes
Other class quality (otherwise equal):
  CV879
Other base:
  6SF5
First Source (s)
30.Jan.1940 : Electron Tube Registration List
Predecessor Tubes 6SF5  
Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Was used by Radio/TV-reception etc.
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 Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
7b4.png
7B4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector
319_1.png 7B4: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		7b4_techdat01.png
7B4: Sylvania Technical Manual
Peter Hoddow
More ...
Usage in Models 1= 1940?? ; 6= 1940 ; 4= 1941 ; 1= 1942 ; 1= 1945? ; 3= 1946? ; 1= 1946 ; 1= 1947?? ; 12= 1947 ; 2= 1948? ; 14= 1948 ; 2= 1949? ; 8= 1950? ; 3= 1951? ; 1= 1954?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):60

Collection of

Walter Nigg (FL)
Collection of a member from FIN
Aldo Patriarca (CH)
Manfred Fries (CH)
Christian Schaufelberger (CH)
Peter Pfeiffer (D)
Georges Werts (B)
Christian Walldorf (SK)
Bruno Candreia (CH)
 
7b4~~1.jpg

7B4
 
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