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Audion (with spherical bulb), 1906

Audion (with spherical bulb), 1906

1906

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

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

1906-1972

De Forest "Photion" tube, 1924.

De Forest "Photion" tube, 1924.

1924

McVitie Weston valve collection, De Forest valve, type DV5

McVitie Weston valve collection, De Forest valve, type DV5

McVitie Weston valve collection, De Forest Audion valve, type 432

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

1906

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

1929

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

De Forest "Photion" tube on wooden holder

1926

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

1929

One full frame and one quarter frame 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

1929

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

1929