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Triode
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A triode is an electronic amplifying vacuum tube consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate.
Examples of low power triodes from 1918 (left) to miniature tubes of the 1960s (right)
Examples of low power triodes from 1918 (left) to miniature tubes of the 1960s (right)
ECC83, a dual triode used in 1960-era audio equipment, showing the orange glow of the hot cathode.
ECC83, a dual triode used in 1960-era audio equipment, showing the orange glow of the hot cathode.
3CX1500A7, a modern 1.5 kW power triode used in radio trans­mitters. The cylindrical structure is a heat sink atta­ched to the plate, through which ai
3CX1500A7, a modern 1.5 kW power triode used in radio trans­mitters. The cylindrical structure is a heat sink atta­ched to the plate, through which air is blown during operation.
De Forest Audion tube from 1908, the first triode. The flat plate is visible on the top, with the zigzag wire grid under it. The filament was original
De Forest Audion tube from 1908, the first triode. The flat plate is visible on the top, with the zigzag wire grid under it. The filament was originally present under the grid but was burnt out.
Transistor
Videos
A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is one of the basic building blocks of modern electronics. It is composed of semiconductor material, u
Triode
…and long-distance telephony possible. Triodes were widely used in consumer electronics devices such as radios and televisions until the 1970s, when transistors replaced them. Today, their main remaining use is in high-power RF amplifiers in radio transmitters and industrial RF heating devices. In recent years…
Transbauformen
Transbauformen
Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in 1925.
Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in 1925.
John Bardeen, William Shockley, and Walter Brattain at Bell Labs in 1948; Bardeen and Brattain invented the point-contact transistor in 1947 and Shock
John Bardeen, William Shockley, and Walter Brattain at Bell Labs in 1948; Bardeen and Brattain invented the point-contact transistor in 1947 and Shockley invented the bipolar junction transistor in 1948.
A replica of the first working transistor, a point-contact transistor invented in 1947
A replica of the first working transistor, a point-contact transistor invented in 1947