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ID = 1694
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to C443N = PP431 = L427D = RES374
Similar Tubes
Normally replaceable-slightly different:
Other base:
First year 1930 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
1930 : -- Collector info (Sammler)
Predecessor Tubes C443   PP430  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC

About 1930 the C443 was replaced by the C443N, which was capable of slightly increasing the output power from 2,8 to 3 Watts but associated by increasing the grid bias from -25 to -42 Volts.[Jacob Roschÿ, 2003-01-17]

Vg1: -45V !!!

Vg2: 200V

Va: 300V

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
  C443N: ficha de valvulas
Getulio Jimenez-Gomez
C443N: Aus eigener Sammlung
Pim J.H. Vercoulen

More ...
C443N: Telefunken Werkstattbuch
Wolfgang Bauer

C443N: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

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from Just Qvigstad

Usage in Models 2= 1930 ; 12= 1931 ; 1= 1932??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):15

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