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7Z4

Information - Help 
ID = 3264
       
Country:
United States of America (USA)
Brand:
Tube type:  Full-Wave Vacuum Rectifier 
Identical to 7Z4 = VT-181 = CV346 = CV1790
Similar Tubes
Normally replaceable-slightly different:
  EZ22
Heater different:
  28Z5
First Source (s)
30.Dec.1940 : Electron Tube Registration List
Predecessor Tubes 6W5G  
Successor Tubes 6BW4   28Z5  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Filament Vf 6.3 Volts / If 0.9 Ampere / Indirect / Parallel, (AC/DC)
Description <100mA mean current, 300mA peak. (Brimar Data Book 1947-48) 
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  7z4.png
  7Z4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Michael Schlör
 
7z4_1.jpg
7Z4: Sammlung PR
Peter Roggenhofer † 25.4.18

 
7z4_1.png
7Z4: Manufacturer's Literature
Emilio Ciardiello

 
7z4_techdat01.png
7Z4: Sylvania Technical Manual
Peter Hoddow


from Just Qvigstad

Usage in Models 3= 1941?? ; 3= 1941 ; 3= 1942?? ; 2= 1942? ; 3= 1942 ; 1= 1943? ; 1= 1944 ; 2= 1945?? ; 2= 1946? ; 3= 1946 ; 8= 1947? ; 6= 1947 ; 3= 1948? ; 23= 1948 ; 6= 1949? ; 15= 1949 ; 2= 1950?? ; 5= 1950? ; 7= 1950 ; 1= 1951?? ; 4= 1951 ; 2= 1953?? ; 2= 1953? ; 20= 1953 ; 4= 1954?? ; 4= 1954? ; 19= 1955?? ; 6= 1960??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):160


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