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ID = 25928
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to DEP240
First year Oct.1928 - - Manufacturers Literature Date of Marconi Publication No. 520A.

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 2 Volts / If 0.4 Ampere / Direct / Battery =

Dull emitter super-power output triode, for use in the last stage of audio amplifying chains. Amplification factor 4; 2500 ohm impedance; 150V anode voltage with 17mA average current at 24V negative grid bias.


This tube was announced in a manufacturer's advertisement in the Wireless World of October 12 1926.

Dimensions (WHD)
incl. pins / tip
46 x 103 x mm / 1.81 x 4.06 x inch
Information source - - Manufacturers Literature   Grundig Röhren-Taschenbuch, 1948
- - Manufacturers Literature   Pamphlet 243
DEP240: M Hamm
Maurice Hamm

DEP240: M Hamm
Maurice Hamm

DEP240: own collection
Peter den Boer

from Just Qvigstad

Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 1715     Replies: 1
DEP240 (DEP240)
Maurice Hamm
  1 Habe dieses valve in eines zelbstbouw radio
Folgendes valves: HL210, DEP240 und PM2.
DEP240 gar kein info Nur ein bemerkung das es ungefer ein B205 handelt.

Nach mailing zu einer english man had er die folgende bemerkung gemacht.

P is Power OUTPUT Valve
nummer 240 = 2V Filiament 0,4 Amps
Anode 120-150V

Text auf glass:
Genau:  D.Ë.P. 240  (umlaut auf E)
Made in England
Marconi Valve
mit logo: BVA British Radio Valve
Konrad Birkner † 12.08.2014

P doesn't necessarily mean Power (e.g. PM1 or PM12 or PM3 or PM5X)

DE often stands for Dull Emitter

B205 would be for a P240


End of forum contributions about this tube

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