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ID = 15076
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Triode, vacuum   Universal 
Identical to WN4
Similar Tubes
Normally replaceable-slightly different:
  E438 ; NW4

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AND current AC/DC

This tube designed for resistance coupled circuits and was also available metal sprayed.

Dimensions (WHD)
incl. pins / tip
48 x 107 x 48 mm / 1.89 x 4.21 x 1.89 inch
Weight 40 g / 1.41 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1931 tube data booklet

triodeindirektb5.png WN4: Triotron Radio Röhrenbroschüre 1928
Thomas Lebeth

Just Qvigstad
WN4: Triotron Radio Röhrenbroschüre 1928
Thomas Lebeth

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