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ID = 19698
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 MT3
First year Jun.1919 British Radio Valves - The Vintage Years, Thrower page 129 - but before = Ediswan

Base TRANSMITTING & Power-TUBES/VALVES in gen Other combinations of connections.
Was used by Transmittertube (Radio)
Filament Vf 6 Volts / If 2.2 Ampere / Direct

Ediswan is probably producing until 1919 when production went to Osram in June 1919. Tube was still listed in the 1932 Marconi Transmitting Valve catalog.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 165 x 75 mm / x 6.50 x 2.95 inch
Information source British Radio Valves - The Vintage Years, Thrower   Pages 69, 71 & 127
- - Manufacturers Literature   
MT3: Fin Stewart collection
Fin Stewart

MT3: Fin Stewart
Fin Stewart

MT3: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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