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ID = 2021
Brand: Valvo Radioröhrenfabrik GmbH; Hamburg
Tube type:  Triode, vacuum   Universal 
Identical to H406 = RE074
Similar Tubes
Normally replaceable-slightly different:
  DK405 ; H412
First year 1926 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Mar.1927 : Funk Bastler 1927 Heft 39

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Literature Taschenbuch zum Röhren-Codex 1948/49   
Hartmut Völler

H406: Telefunken Werkstattbuch
Wolfgang Bauer

H406: Valvo Daten Heft 1930
Trev Levick

Usage in Models 1= 1926 ; 1= 1927? ; 6= 1928? ; 3= 1928 ; 2= 1929 ; 1= 1930??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):14

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