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MT1_Ediswan

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ID = 19693
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Marconi's Wireless Telegraph Co. Ltd. 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to MT1_Ediswan = MT1_MOV
First year Mar.1919 ?? British Radio Valves - The Vintage Years, Thrower page 129 (before = Ediswan)
First Source (s)
Mar.1919 : British Radio Valves - The Vintage Years, Thrower p.126

Filament Vf 9 Volts / If 5.5 Ampere / Direct
Description Ediswan is probably producing until 1919 when production went to Osram. 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   p.381
 

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