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Demountable triodes

Wireless World, November, 1939.
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The electrode assembly of the new demountable triode valves of the continuously-evacuated type which have been developed by the General Electric engineers at Schenectady for the Companys 100 kW short wave station WGEO. Whilst the BBC uses large demountable screen grid valves for some transmitters, the new American triodes are the largest of their kind in the world.

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