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E441

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ID = 2503
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to E441 = DW1 = B2_SIF = 4A15_Ultron = DW1_Mazda = U4100D = DG4101
Similar Tubes
Normally replaceable-slightly different:
  DG4100 ; DW13 ; Dn44 ; E441N ; REN704d
Other base:
  B2_SIF-7pin ; E441_2S ; E441_7pin ; I4043 ; RS4141 ; RS4341 ; TM4
First year Nov.1928 -- Original-techn. papers.
Successor Tubes 1933   E448  
Base Europe 5-Pin , B5 + side contact (Codex=Fa / sp)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description

redecessors: none, Successors / Nachfolger: E448, RENS1224, X4122 By its construction this tube is a space- charging-grid tetrode, but should be used as self oscillating frequency converter. The oscillator feedback is applied to grid 1, the input signal to grid 2. Its amplification is low and not to control, the oscillator voltage is closely coupled to the input circuit..

 
Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
6_3.png E441: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		e441_techdat01.png
E441: Philips Röhren Daten 1933
Peter Hoddow
More ...
Usage in Models 1= 1929?? ; 2= 1929 ; 2= 1930 ; 1= 1931? ; 1= 1932?? ; 4= 1932 ; 1= 1933 ; 1= 1934?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):13

Collection of

Antonio Martins-Pais (P)
Christian Schaufelberger (CH)
Christian ADAM (F)
Aldo Patriarca (CH)
 
e441_philips_1.jpg

E441
 
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