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81

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ID = 2998
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to 81 = C-281 = UX281 = CV2546 = PH281 = 181_Arcturus = 481 = X281
Similar Tubes
Normally replaceable-slightly different:
  38181 ; FX281 ; R81_USA ; V781 ; VX2810
First Source (s)
Dec.1927 : -- Collector info (Sammler)

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Parallel, (AC/DC) /
Tube prices 1 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

  81.png
  81: Internet
Miguel Angel Trujillo-Rodriguez
 
81.jpg
81: K.H.Fischer
Karlheinz Fischer

 
424_2.png
81: Telefunken Werkstattbuch
Wolfgang Bauer

 
81_techdat01.png
81: Sylvania Technical Manual
Peter Hoddow


Usage in Models 2= 1925 ; 3= 1926 ; 13= 1927 ; 2= 1928?? ; 36= 1928 ; 1= 1929?? ; 10= 1929? ; 33= 1929 ; 8= 1930?? ; 3= 1930 ; 1= 1931?? ; 1= 1931 ; 1= 1932?? ; 10= 1932? ; 2= 1932 ; 6= 1933 ; 3= 1934 ; 1= 1935? ; 2= 1936? ; 1= 1938 ; 1= 1940
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):140

81*Box
   

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