radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

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 / 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   
  7b4.png
  7B4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7b4~~1.jpg
7B4: common type USA
Georges Werts

 
319_1.png
7B4: Telefunken Werkstattbuch
Wolfgang Bauer

 
7b4_techdat01.png
7B4: Sylvania Technical Manual
Peter Hoddow


from Just Qvigstad

Usage in Models 1= 1940?? ; 6= 1940 ; 4= 1941 ; 1= 1942 ; 1= 1945? ; 3= 1946? ; 1= 1946 ; 1= 1947?? ; 12= 1947 ; 1= 1948? ; 15= 1948 ; 1= 1949? ; 3= 1950? ; 1= 1954?

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


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
rmXorg