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81

Information - Help 
ID = 2998
       
Country:
United States of America (USA)
Brand:
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to 81 = UX281 = CV2546 = PH281 = C-281 = 181_Arcturus = 481 = CX381 = D1/2 = ER81 = PR281 = RE-2 = X281 = T-81 = G81 = NX-281 = RayX-281 = RYB281 = PA281 = MX281 = NU-81 = TC281 = TX181 = SLX281
Similar Tubes
Normally replaceable-slightly different:
  38181 ; FX281 ; R81_USA ; V781 ; VX2810
First Source (s)
Dec.1927 : -- Collector info (Sammler)
Successor Tubes SLX281  
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 / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip		 x 158 x 54 mm / x 6.22 x 2.13 inch
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  81.png
  81: Internet
Miguel Angel Trujillo-Rodriguez
 
20200525_161825.jpg
81: RMG
Robert Gillespie
More ...
 
4b.png
81
Emilio Ciardiello
More ...
 
81_techdat01.png
81: Sylvania Technical Manual
Peter Hoddow
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from Just Qvigstad
Usage in Models 2= 1925 ; 1= 1926? ; 2= 1926 ; 13= 1927 ; 2= 1928?? ; 39= 1928 ; 1= 1929?? ; 10= 1929? ; 33= 1929 ; 9= 1930?? ; 3= 1930 ; 1= 1931?? ; 1= 1931 ; 2= 1932?? ; 10= 1932? ; 2= 1932 ; 6= 1933 ; 3= 1934 ; 1= 1935? ; 2= 1936? ; 1= 1938 ; 1= 1940
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):145
Collection of Karlheinz Fischer (D)
Collection of Giuseppe Antonio Tusini (I)
Collection of Fin Stewart (AUS)
Collection of Jose Luis Villabona Horreo (E)
Collection of Robert Gillespie (USA)
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