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

7A4

Information - Help 
ID = 3559
       
Country:
United States of America (USA)
Brand:
Tube type:  Triode, vacuum   Universal 
Identical to 7A4 = VT-192 = CV1770
Similar Tubes
Other class quality (otherwise equal):
  XXL
Heater different:
  14A4
Other base:
  6J5GT
First Source (s)
08.Mar.1939 : Electron Tube Registration List
Predecessor Tubes 6J5G   6J5   6P5G   6P5GT  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description = 1 unit of 7N7 
Text in other languages (may differ)
Tube prices 3 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

7a4.png
7A4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector

319.png 7A4: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
7a4_techdat01.png
7A4: Sylvania Technical Manual
Peter Hoddow

More ...
Usage in Models 6= 1939 ; 1= 1940?? ; 12= 1940 ; 1= 1941? ; 29= 1941 ; 7= 1942 ; 1= 1946?? ; 7= 1946 ; 1= 1947? ; 8= 1947 ; 8= 1948? ; 34= 1948 ; 1= 1949? ; 4= 1949 ; 7= 1951?? ; 2= 1952?? ; 1= 1953?? ; 1= 1955??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):131

Collection of

 
7a4_pic2.jpg

7A4
 

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]
  

Data Compliance More Information