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ID = 15731
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to D404 = P460 = RE604 = RO4404 = LK460 = PX460 = 4K60 = AC044X = 601
Similar Tubes
Normally replaceable-slightly different:
  10-250 ; 475K ; 4C102 ; 4XP ; DT11 ; P10 ; P4_Sator ; R80 ; T34
Other class quality (otherwise equal):
Other base:
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets
Successor Tubes AD1   AD1_4pin  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Direct / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
54 x 137 x 35 mm / 2.13 x 5.39 x 1.38 inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
  D404: ficha de valvulas
Getulio Jimenez-Gomez
    More ...
Peter den Boer

More ...
D404: g.h.
Gerhard Heigl

D404: Philips Verstärkerröhren
Gerhard Heigl

More ...

from Just Qvigstad

Usage in Models 1= 1928 ; 1= 1930? ; 1= 1930

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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