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E448

Information - Help 
ID = 2893
       
Country:
Netherlands
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):
  T5-448
Heater different:
  B2048
First year 1933 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Apr.1933 : Philips Bulletin #D6
Predecessor Tubes REN704d   U4100D  
Successor Tubes AK1  

Base Europe 7-Pin (C7A, C, 1933) (Codex=Lf) Top contact with a cap
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  e448.gif
  E448: ficha de valvulas
Getulio Jimenez-Gomez
 
e448_philips_01.jpg
E448: Collection TL
Thomas Lebeth

 
10_2.png
E448: Telefunken Werkstattbuch
Wolfgang Bauer

 
e448_spec.png
E448: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


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

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


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