Early electronic valve, diagram

Early electronic valve, diagram

V510/0042 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 24.8MB

Downloadable file size: 483.4KB

Price image Pricing

Please login to use the price calculator


Caption: Audion amplifier. Diagram of an Audion triode valve that was the first amplifier. It was invented by Lee De Forest in 1907. De Forest worked on vacuum tubes, which act as diodes (devices that allow electricity to flow one way only). The addition of a grid (yellow) allowed the amplification of weak radio signals (top), which made radio a practical method of transmitting information.

Release details: Model release not required. Property release not required.

Keywords: 20th century, amplification, amplifier, artwork, audion, de forest, deforest, diagram, electric, electrical, electricity, electronic, historical, history of science, physics, technology, thermionic, triode, tube, twentieth, valve

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.