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H4128D Info
Country:  Germany      Brand:  Valvo Radioröhrenfabrik GmbH; Hamburg 
  Tube type:  PENTODE   RF/IF-Stage 
Tube ID = 1788
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Identical to H4128D = RENS1284 = E446
Similar Tubes S430N (can normally be replaced - small diff'ce)   S435N (can normally be replaced - small diff'ce)  
First Series   1933 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s) Jun.1933 : Funkschau (FS)
Successor Tubes 1935 AF7  

Base Europe 5-Pin (O5A, B5) (Codex=Fco) Top contact screw type
Was used by Radio/TV-reception etc.
Filament -: Indirect / If: 1.1 Ampere / Vf 4 Volts /
Tube prices 2 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   

h4128d_im.jpg
IM
Iven Müller

 
13_8.png
Telefunken Werkstattbuch
Wolfgang Bauer

 
h4128d_spec.png
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

Usage in Models   1= 1933?? ; 2= 1933? ; 1= 1934? ; 2= 1935 ; 1= 1936 ; 1= 1937 ;
Number of Models with this tube   8
No further Information for

H4128D    

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03DecX