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ID = 2529
Brand: Valvo GmbH, Radioröhrenfabrik; Hamburg
Tube type:  Vacuum Pentode   Power/Output 
Identical to L427D = C443N = PP431 = RES374
First year 1931 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Aug.1931 : Funk Bastler 1931 Heft 33
Predecessor Tubes L425D   PP430  
Successor Tubes 1933   L496D  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Filament Vf 4 Volts / If 0.25 Ampere / Direct
Description 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] 
Text in other languages (may differ)
Tube prices 2 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
L427D: scc
Christian Schaufelberger

More ...
L427D: Telefunken Werkstattbuch
Wolfgang Bauer

L427D: Valvo-Röhren-Daten 1934
Jacob Roschy

from Just Qvigstad

Usage in Models 1= 1931? ; 2= 1932 ; 6= 1933 ; 1= 1934?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

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