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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   Universal 
Identical to MT5B
First year 1919 ? British Radio Valves - The Vintage Years: 1904-1925 page 129 but Ediswan before ...

Base TRANSMITTING & Power-TUBES/VALVES in gen
Was used by Transmittertube (Radio)
Filament Vf 5.8 Volts / If 2 Ampere / Direct / Battery =
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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