The 'Audion Piano' and Audio Oscillator. Lee De Forest. USA, 1915 – 120 Years of Electronic Music
Lee de Forest | American inventor | Britannica
De Forest dual filament Audion vacuum tube, 1908 - Lee de Forest (1873-1961) — Google Arts & Culture
Audion Vacuum Tube - History-Computer
The Triode is 100 Years Old This Year | Nuts & Volts Magazine
Audion Vacuum Tube - History-Computer
De Forest Audion Tube, circa 1908 - The Henry Ford
File:First internal grid Audion tube.jpg - Wikimedia Commons
Audion – 1906 - Magnet Academy
De Forest Audion Tube- Paving the Way for Radio in 1906
Audion Tube · Physical, Electrical, Digital
Lee DE Forest.org
File:Audion vacuum tube advertisement.png - Wikimedia Commons
File:Audion vacuum tube construction.png - Wikimedia Commons
Birth of the Electron Tube Amplifier, March 1957 Radio & Television News - RF Cafe
Rare de Forest Audion Donated to ARRL, Mated with Vintage Radio for Museum Display
DeForest Tubular Audion
An early audion radio receiver built by the inventor of the audion vacuum tube, Lee De Forest, around 1914 Stock Photo - Alamy
Lee de Forest | American inventor | Britannica
Audion Audiotron Vacuum Detector Tube 1915 Super RARE!!! Historic Tubular Lee De Forest Cunningham Vintage Amplifier Valve Early Radio Hand Blown Glass AMAZING! - Vintage
An X-ray of Historic Audion vacuum tube | Sciencephotography.com
Lee DE Forest.org
Tubes/Valves
Audion vacuum tube | 102711687 | Computer History Museum
