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MT5B

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ID = 19701
       
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 
Identical to MT5B
First year 1919 ? British Radio Valves - The Vintage Years, Thrower page 129 but Ediswan before ...

Base TRANSMITTER-Base in gneral
Filament Direct
Description Ediswan is probably producing until 1919 when production went to Osram. 
 

Usage in Models 1= 1920??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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