radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

Dn904

Information - Help 
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 ; RENS1374d

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 / Specified voltage 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 Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 205, p. 404
- - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49

u.png Dn904
Peter den Boer


Just Qvigstad
dn904data.png
Dn904: own collection
Peter den Boer

 

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  

Data Compliance More Information