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71

Information - Help 
ID = 2858
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Triode, vacuum   Power/Output 
Identical to 71 = 482A_diffdat = CX71A = 171 = MX171 = DC-171 = UX171
Similar Tubes
Normally replaceable-slightly different:
  C-171 ; J71
Heater different:
  CX371A
First year May.1926 Saga of the Vacuum Tube, Tyne page 316
Successor Tubes 1926   UX171A  
Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Filament Vf 5 Volts / If 0.25 Ampere
Description 71 is actually a later short name - somehow incorrect - but probably found on schematics. Tyne page 315: "The design of the UX171 was started early in 1925. It followed the construction of the UX201A rather closely and had a thoriated tungsten filament operating at 5 volts and 0.5 ampere. At the maximum recommended anode voltage of 180 volts, it would deliver 0.7 watt output. In October 1925 it was adopted by RCA but was not advertised or sold to the public untl June 1926. In November 1926 it was replaced by the UX171A, which had an oxide-coated filament operating with 0.25 ampere at 5 volts." But follows: "At the time the UX171 was brought out (May 1926), RCA also announced a new detector tube, the UX200A, to replace the UX200. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
s_217_g_2.gif 71: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

Just Qvigstad 		71_characteristics.png
71: My schematic collection.
Pier Antonio Aluffi
Usage in Models 8= 1927? ; 9= 1927 ; 10= 1928 ; 3= 1929 ; 1= 1930?? ; 3= 1930? ; 4= 1930 ; 1= 1931 ; 2= 1932?? ; 1= 1932? ; 4= 1932 ; 1= 1934? ; 1= 1935?? ; 1= 1936? ; 2= 1970??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):51
 
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