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ID = 30689
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Power/Output 
Identical to DE5_Marconi
Similar Tubes
Other class quality (otherwise equal):
Other characteristic (electr. data):
First year 1924 - - Manufacturers Literature Marconi Sales List 1924
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower
Oct.1928 : - - Manufacturers Literature Date of Marconi Publication No. 520A.

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

One of the first Dull Emitter Tubes and appears on Marconi sales lists in November 1924.

The filament voltage is specified as in the range 5 to 6V and anode voltages from 20 to 60V giving an amplification factor of 7.

Dimensions (WHD)
incl. pins / tip
52 x 118 x mm / 2.05 x 4.65 x inch
Weight 50 g / 1.76 oz
Information source Babani, International Radio Tube Encyclopaedia   1925 Brown Brothers Catalog 217
Saga of the Vacuum Tube, Tyne   
- - Manufacturers Literature
DE5_Marconi: RFJ
Roy Johnson

More ...
DE5_Marconi: Fin Stewart
Fin Stewart

DE5_Marconi: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1924??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Forum contributions about this tube
Threads: 1 | Posts: 1
Hits: 2057     Replies: 0
DE5_Marconi (DE5_Marconi)
Gerhard Eisenbarth

Testbericht zur Röhrentype DE5 von Marconi-Osram.

Quelle: The Wireless World and Radio Review, 30.July 1924


End of forum contributions about this tube

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