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447

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ID = 10826
       
Country:
United States of America (USA)
Brand:
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 447 = ER247 = 47 = UY247 = C347
Similar Tubes
Normally replaceable-slightly different:
  TU247

Base UY-Base, 5 Pins (USA, April 1927) (Codex=Hy)
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Direct / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
54 x 137 x mm / 2.13 x 5.39 x inch
Weight 68 g / 2.40 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
70 Years of Radiotubes and V.   Page 166
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren

s_226_g_1.gif 447: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

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Just Qvigstad
ad_deforest_447_451sm.png
447: Electronics, May 1931
Achim Dassow

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Usage in Models 2= 1931 ; 4= 1932? ; 4= 1932 ; 3= 1933? ; 1= 1933

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):14

Collection of

 
deforest_447_11.jpg

447
 

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