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Locomotion
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Locomotion
National Railway Museum
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Electronic Components
3
Maker
De Forest, Lee
1
Lee De
1
Object type
audion
3
Place
United States
1
Material
brass (copper, zinc alloy)
1
glass
1
plastic (unidentified)
1
textile covered electrical wires
1
wood (unidentified)
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De Forest Audion, c.1909
De Forest Audion, c.1909
circa 1909
De Forest type T Audion, c.1916
De Forest type T Audion, c.1916
1916
Spherical Audion tube with mounting.
Audion (with spherical bulb), 1906
1906