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ID = 19956
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Vacuum Pentode   Power/Output 
Identical to P425_Triotron
Similar Tubes
Normally replaceable-slightly different:
  L425D ; M43 ; P443 ; PP415 ; PP430 ; RES364
Other base:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC

"Undistorted output 1800mW" Advertisement December 2nd 1931

Information source Taschenbuch zum Röhren-Codex 1948/49   
Wireless World (The), London (WW, 79)   Advertisement Dec 2 1931
- - Manufacturers Literature
P425_Triotron: R.O.
Rudolf Osterkamp

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P425_Triotron: Triotron Röhrenkatalog von 1942
Wolfgang Bauer

P425_Triotron: Triotron Röhrenkatalog von 1942
Wolfgang Bauer

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from Just Qvigstad

Usage in Models 2= 1933

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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