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447

Information - Help 
ID = 10826
       
Country:
United States of America (USA)
Brand:
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 447 = 47 = UY247 = C347 = ER247

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
 
deforest_447_11.jpg
447: aus ebay, Verkäufer uncle-papa
Gottfried Silberhorn

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

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ad_deforest_447_451sm.png
447: Electronics, May 1931
Achim Dassow

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from Just Qvigstad

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


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