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ID = 18993
Great Britain (UK)
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to V24 = UM-103A
Similar Tubes
Normally replaceable-slightly different:
Heater different:
First year 1916 Saga of the Vacuum Tube, Tyne page 223, 224
Successor Tubes DEV  

Base SPECIAL TUBEBASE in general
Was used by Military and/or Government
Filament Vf 5.2 Volts / If 0.75 Ampere / Direct / Battery =

Va= 24-50 V. Various technical differences in tubes made from 1919 to 1925, for example filament tension springs. First made by Osram Lamp Works October 1919. British Navy version NR9. Mullard version S3. Some MOV V24 tubes exist with a painted part of the lower end of the bulb. This can be either orange, frosted, green or blue and was a "color coding" to identify certain users.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
18 x 73 x mm / 0.71 x 2.87 x inch
Weight 12 g / 0.42 oz
Tube prices 16 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
British Radio Valves - The Vintage Years: 1904-1925   as per advert in
The Saga of Marconi Osram Valve
History of GEC and the Marconi Osram Valve

Emilio Ciardiello

triode.png V24: Fin Stewart
Fin Stewart

V24: own collection
Peter den Boer

More ...
Usage in Models 1= 1916? ; 1= 1917? ; 1= 1917 ; 1= 1918?? ; 3= 1920?? ; 1= 1920 ; 3= 1922?? ; 15= 1922 ; 1= 1923?? ; 6= 1923 ; 1= 1924?? ; 1= 1925??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):35

Collection of



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