Radio valve of Clearton valve type.
4 0 c m
actual image size: 24cm x 32cm

Radio valve of Clearton valve type.

Whicher, Adrian

© Science Museum / Science & Society Picture Library


Lee de Forest (1873-1961) was an American electrical engineer and inventor. In 1907, while working for the Western Electric Company, he patented the thermionic triode, or radio valve. Esentially a diode with an additional electrode between the cathode and the anode, the triode was able to amplify weak electrical signals, making it a crucial invention for the development of radio. For 50 years, radio receivers relied on valves, until being generally replaced by the transistor from the 1950s.



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