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2A7 Info
Country:  United States of America (USA)      Brand:  Common type USA 
  Tube type:  Pentagrid-Converter (Heptode)   Pentagrid (old)   Controlling (mu) 
Tube ID = 2651
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Identical to 2A7 = Ut-2A7 = ER2A7
Similar Tubes 6A7 (Heater different)   Ut6A7 (Heater different)   Ut-6A7 (Heater different)   2A7S (other shape (e.g. bulb, size))  
First Series   1933 Radios von gestern
Successor Tubes 6A8   6A8G  

Base 7-Pin-Base U7A = small, old, USA (Codex=Mh) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament -: Indirect / -: Parallel, (AC/DC) / If: 0.8 Ampere / Vf 2.5 Volts /
Tube prices 0 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

  2a7.gif
  Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus
2a7.jpg
Röhrensammlung
Wolfgang Bauer

 
491.png
Telefunken Werkstattbuch
Wolfgang Bauer

 
2a7_techdat01.png
Cunningham Radiotron Manual
Peter Hoddow

Usage in Models   4= 1932 ; 9= 1933?? ; 8= 1933? ; 87= 1933 ; 19= 1934?? ; 16= 1934? ; 130= 1934 ; 11= 1935?? ; 9= 1935? ; 83= 1935 ; 6= 1936?? ; 11= 1936? ; 22= 1936 ; 1= 1937?? ; 1= 1937? ; 5= 1938 ; 1= 1939?? ; 2= 1941?? ; 3= 9999 ;
Number of Models with this tube   428
No further Information for

2A7    

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