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ID = 7720
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Power/Output 
  <1925 rare.
Identical to DE5
Similar Tubes
Normally replaceable-slightly different:
Heater different:
Other base and data slightly different:
  DE5_UV ; DE5_UX

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 5.5 Volts / If 0.25 Ampere / Direct / Battery =

Power triode for the last stage of audio amplifying chains. Mu 7. Va 140V, with 9V negative grid bias and 8000 ohms out impedance. Heater could be operated between 5 and 6V.

Dimensions (WHD)
incl. pins / tip
55 x 125 x mm / 2.17 x 4.92 x inch
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   Marconi catalog No. 520, Sept. 1928
DE5: Manufacturer's Literature
Emilio Ciardiello

More ...
DE5: rtt
Anonymous 10 Collector

DE5: own collection
Peter den Boer

More ...

from Just Qvigstad

Usage in Models 1= 1920?? ; 2= 1923 ; 5= 1924 ; 1= 1925? ; 2= 1925 ; 2= 1926 ; 1= 1927?

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

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