Lee de Forest 1873 - 1961

occupation:
Electronics engineer, Inventor
Nationality:
American

1906 invented the triode (audion); developed sound for motion pictures

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De Forest audion 1906-1915

Audion (with spherical bulb), 1906

De Forest Audion soft detector triode (McVitie Weston valve collection), 1906-1972

De Forest "Photion" tube, 1924.

Print, portrait: Lee de Forest

McVitie Weston valve collection, De Forest valve, type DV5

McVitie Weston valve collection, De Forest Audion valve, type 432
Audion thermionic triode valve by De Forest One of the first valves to have a grid

Audion thermionic triode valve
Six full frames and one quarter frame of 35mm positive De Forest variable density sound film showing a long shot of a kitchen area on one side with a table and chair, a dresser with cups and plates arranged on it, and a lamp on a table in the background. A woman wearing an apron going upstairs on the other side.

De Forest Variable Density Sound
De Forest "Photion" tube on a wooden holder, 1926.

De Forest "Photion" tube on wooden holder
Two frames of black and white 35mm positive De Forest Variable Density Sound film showing a long shot of a kitchen area on one side with a table and chair, a dresser with cups and plates arranged on it, and a lamp on a table in the background. A woman wearing an apron going upstairs on the other side.

De Forest Variable Density Sound

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