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» Vacuum tubes by types » Triodes
A triode is an electronic amplifying vacuum tube which consists of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode). Invented in 1906 by Lee De Forest by adding a grid to the Fleming valve, the triode was the first electronic amplification device, and the ancestor of other types of vacuum tubes such as the tetrode and pentode. Its invention founded the electronics age, making possible amplified radio technology and long-distance telephony. 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. The word is derived from the Greek triodos, from tri- (three) and hodos (road, way), originally meaning the place where three roads meet.
Single triode Double triode
6S7B MELZ single triode miniature tube
6CC42 / 2C51 / 5670 / 6N3P Tesla tube
E182CC / CV5766 / 7119 MULLARD PHILIPS double t...
6J6 Tungsram tube
ECC83 / 12AX7 MULLARD tube (original box)
6S41S / 6C41C audiophile tube
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