Simplified diagram of a triode. The plate and wire grid are typically concentric cylinders around a central cathode. The heater (filament) is usually not connected to the cathode.
A triode is a type of vacuum tube (or valve in British English) with three elements: the filament or cathode, the grid, and the plate or anode. The triode vacuum tube was the first electrical amplification device. Diagram of Vacuum-Tube Triode File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Diagram of Vacuum-Tube Triode File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... In electronics, a vacuum tube (U.S. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ... Filaments surrounding a solar flare, caused by the interaction of the plasma in the Suns atmopshere with its magnetic field. ... Diagram of a copper cathode in a Daniells cell. ... An electrode used in Thermionic valves (tubes) used to modulate the flow of electrons in the cathode to anode or plate circuit. ... Plate has several meanings: A plate electrode in a vacuum tube. ... Diagram of a zinc anode in a Daniells cell. ... For guitar amplifier, go to Instrument amplifier An amplifier can be considered to be any device that uses a small amount of energy to control a larger amount, although the term today usually refers to an electronic amplifier. ...
Triodes are largely obsolete, having been replaced by the transistor, but do still find application where power consumption and overall size are not concerns, but low component count and high power capacity are. They are also still valued by musicians and audiophiles for amplification purposes, as some claim that triodes are still more linear at audio-frequency ranges. Assorted transistors Transistor was also a common name for a 1960s era handheld transistor radio. ... A musician is a person who plays or composes music. ... An audiophile, most generally, is a lover of sound or music, but the word is more commonly used about someone who cares about hi-fi playback of sound recordings, rather than live performances. ... Audio can mean: Sound that can be heard. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
A triode is an electrical circuit component that uses a small voltage to control a relatively large flow of current.
A triode is a type of vacuum tube (or valve in British English) with three elements: the filament or cathode, the grid, and the plate or anode.
Triodes are largely obsolete, having been replaced by the transistor, but do still find application where power consumption and overall size are not concerns, but low component count and high power capacity are.
De Forest's Audion tube came to be known as the triode tube, because it had three elements: filament, grid, and plate (just as the "di" in the name diode refers to two elements, filament and plate).
Thus, the triode functions as an amplifier of the incoming AC signal (taking high-voltage, high-current DC power supplied from the large DC source on the right and "throttling" it by means of the tube's controlled conductivity).
In the triode, the amount of current from cathode to plate (the "controlled" current is a function both of grid-to-cathode voltage (the controlling signal) and the plate-to-cathode voltage (the electromotive force available to push electrons through the vacuum).
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