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DHD

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ID = 14105
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to DHD
First year 1933 The Saga of Marconi Osram Valve

Base British-7-Pin, old (M7A) (Codex=Nb)
Filament Vf 16 Volts / If 0.25 Ampere / Indirect / Series, DC
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
marconi_dhd.jpg
DHD: Foto from own collection
Bjarne Jensen

 
523_5.png
DHD: Telefunken Werkstattbuch
Wolfgang Bauer

 
dhd_spec.png
DHD: Marconi Advertisement
Anonymous 15 Collector



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