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Dn904

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ID = 11174
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Double Grid Power Amplifier   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to Dn904
Similar Tubes
Normally replaceable-slightly different:
  APP4120 ; E453

Base Europe 5-Pin , B5 + side contact (Codex=Fdo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.2 Ampere / Indirect / Parallel, (AC/DC)
Description

Tungsram and Radio Record made a kind of tetrode with penthode characteristics to avoid the Philips patent on the penthode. In most of the tube manuals these tetrodes are drawn and called penthode.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
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Dn904
Peter den Boer

 
dn904data.png
Dn904: own collection
Peter den Boer


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