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ID = 2503
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to E441 = U4100D = DG4101 = DW1 = B2_SIF = 4A15_Ultron = RS4141 = RS4341 = DW1_Mazda
Similar Tubes
Normally replaceable-slightly different:
  DW13 ; Dn44 ; E441N ; I4043 ; REN704d ; TM4
Other base:
First year Nov.1928 -- Original-techn. papers.

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fa / sp) Sidecontact.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)

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   
E441: Eigene Sammlung
Aldo Patriarca

E441: Telefunken Werkstattbuch
Wolfgang Bauer

E441: Philips Röhren Daten 1933
Peter Hoddow

from Just Qvigstad

Usage in Models 1= 1929 ; 2= 1930 ; 1= 1931? ; 1= 1932?? ; 3= 1932 ; 1= 1933 ; 1= 1934?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

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