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20

Information - Help 
ID = 5631
       
Country:
United States of America (USA)
Brand:
Tube type:  Triode, vacuum   Power/Output 
Identical to 20 = CX220 = UX220 = CX320 = 220_USA = NU-20
Similar Tubes
Normally replaceable-slightly different:
  120 ; ER120
First Source (s)
Nov.1925 : -- Collector info (Sammler)

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 3.3 Volts / If 0.125 Ampere / Direct / Battery =
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  valvula20.png
  20: Internet
Miguel Angel Trujillo-Rodriguez
 
20004_klein.jpg
20
Geri Meier

 
171_10.png
20: Telefunken Werkstattbuch
Wolfgang Bauer

 
20.png
20: Raytheon Databook 1937
Emilio Ciardiello


from Just Qvigstad

Usage in Models 1= 1925 ; 1= 1926 ; 1= 1927 ; 2= 1928 ; 1= 1931?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):6


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