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ID = 2893
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  HEXODE   Frequency converter 
Identical to E448 = X4122 = RENS1224 = H425N = NSS45 = MH4100 = TE48 = 5-448 = QV4100
Similar Tubes
Other shape (e.g. bulb type):
Heater different:
First year 1933 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Apr.1933 : Philips Bulletin #D6
Sep.1933 : L'Histoire Singulière du Tube Radio; G. Duperray 2009
Predecessor Tubes REN704d   U4100D   E441  
Successor Tubes AK1  

Base Europe 7-Pin C7A (Hx C, C7, C) 1933 (Codex=Lf) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
  E448: ficha de valvulas
Getulio Jimenez-Gomez
E448: Collection TL
Thomas Lebeth

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E448: Telefunken Werkstattbuch
Wolfgang Bauer

E448: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

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from Just Qvigstad

Usage in Models 3= 1933 ; 1= 1934 ; 1= 1935

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

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