Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 19702
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Marconi's Wireless Telegraph Co. Ltd. 
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to MT6
First year 1919 British Radio Valves - The Vintage Years, Thrower page 129 but Ediswan before ...

Base TRANSMITTING & Power-TUBES/VALVES in gen Wires only.
Was used by Transmittertube (Radio)
Filament Vf 15.5 Volts / If 10 Ampere / Direct

Ediswan is probably producing until 1919 when production went to Osram.
The anode power rating was 400W with voltage up to 12kV.
The valve comprised a number of components shown as a progessive assembly in the photograph from right to left:-
A* A drawn tungsten filament with a steatite button support.
B* The glass foot which carries the platinum wire connected to the anode.
C* The foot with two nickel strips which were pinched on to the filament.
D* The fine mesh grid of nickel wire with a nichrome frame.
E* The grid mounted on the filament foot tube - the steatite button centralises the filament.
F* The nickel anode with its mounting.
G* The plate connected up and mounted on the foot tube.
All components were heated to red heat by applying potentials to the grid and anode. Evacuation was by means of a Langmuir mercury vapour pump connected to a side tube. Manufactured in Hammersmith by M.O. Valve Company. Source Dowsett 1923.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
160 x 380 x mm / 6.30 x 14.96 x inch
Information source - - Data from my own collection   
British Radio Valves - The Vintage Years, Thrower   Page 127
MT6: Dowsett
Roy Johnson

MT6: Dowsett
Roy Johnson

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]