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ID = 53835
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Diode-Tetrode   Universal 
  Ca. 1925 up to 1945 rare.
Identical to E444N_UX6pin
Similar Tubes
Other base:

Base 6-Pin-Base U6A, old, USA Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.1 Ampere / Indirect / Specified voltage AC/DC

Detector diode and screen grid tetrode for LF amplification.In tube manuals I can not find any difference between the E444 and E444N. This type was sold only a few years.

Dimensions (WHD)
incl. pins / tip
50 x 144 x 35 mm / 1.97 x 5.67 x 1.38 inch
Information source - - Manufacturers Literature   

17a-e444n-ux6.png E444N_UX6pin
Peter den Boer

More ...

Just Qvigstad
E444N_UX6pin: Philips Röhren Daten 1933
Peter Hoddow

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