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31

Information - Help 
ID = 3650
       
Country:
United States of America (USA)
Brand:
Tube type:  Triode, vacuum   Power/Output 
Identical to 31 = VT-31 = CX331 = 231 = RCA231 = CV947 = PH231 = 131 = 431 = ER31 = ER231 = C-231 = NU-31 = NX-231
Similar Tubes
Normally replaceable-slightly different:
  38031 ; FP60
First year 1930 Radios von gestern, 2. Auflage
First Source (s)
Sep.1930 : -- Collector info (Sammler)
Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.13 Ampere / Direct / Battery =
Description

First USA 2V battery type output tube.

 
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
70 Years of Radiotubes and V.
Saga of the Vacuum Tube, Tyne
  31.png
  31: Internet
Miguel Angel Trujillo-Rodriguez
 
31_cdn_marconi_rmf.jpg
31: My Collection
Bruce Morgenstern
 
171_13.png
31: Telefunken Werkstattbuch
Wolfgang Bauer
 
31_techdat01.png
31: Sylvania Technical Manual
Peter Hoddow

from Just Qvigstad
Usage in Models 2= 1930?? ; 9= 1930 ; 1= 1931?? ; 7= 1931? ; 12= 1931 ; 7= 1932? ; 11= 1932 ; 1= 1933 ; 1= 1934?? ; 2= 1934 ; 3= 1935 ; 1= 1937 ; 3= 1938
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):60
Collection of Jose Vigil (RA)
Collection of Lindsay Shepherd (AUS)
Collection of Bruce Morgenstern (CDN)
Collection of David Erali (USA)
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