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DE4

Country:  Great Britain (UK)      Brand:  Marconi-Osram - (Valves/Tubes); GB 
  Tube type:  Triode, vacuum   Power/Output 
  <1925 rare.
Tube ID = 7719
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Identical to DE4
Similar Tubes Normally replaceable-slightly different:
 C9_Fotos
First Source (s) 1925 : Saga of the Vacuumtube, Tyne p.382

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 3.8 Volts / If: 0.3 Ampere / -: Direct / -: Parallel, (AC/DC) /
Description Low Frequency Power Amplifying Valve.
Codex erroneously says 4 V; 0.08 A; similar to RE084, which is not correct. 
Dimensions (WHD)
incl. pins / tip
55 x 125 x mm / 2.17 x 4.92 x inch
Literature - - Manufacturers Literature   1924
Taschenbuch zum Röhren-Codex 1948/49

eu17_14.png
DE4: eigene Zeichnung nach RTT
Werner Braun

 
de4_spec.png
DE4: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Usage in Models   1= 1924 ; 1= 1927?
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):   2

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