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A440N

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ID = 3919
       
Country:
Austria
Brand: Triotron (tubes) = Brand of Schrack, Austria
Developer: Triotron (tubes) = Brand of Schrack, Austria 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to A440N
Similar Tubes
Normally replaceable-slightly different:
  AR4120 ; E499 ; W4110
Heater different:
  REN914
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)
Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source - - Manufacturers Literature   1935
Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
7_80.png A440N: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		a440ndata.png
A440N: own collection
Peter den Boer
Usage in Models 1= 1932 ; 2= 1933 ; 1= 1934
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):4

Collection of

Jacob Roschy (D)
 
a440n_86rm10d~~1.jpg

 
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