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A triode is an electronic amplifying vacuum tube ... Triodes were widely used in consumer electronics devices such as radios and televisions until the 1970s, ...
The 845 power triode is a radio transmitting vacuum tube which can also be used as an audio amplifier and modulation tube. Typically, the plate is machined from solid graphite in order to accommodate high power dissipation (up to 100 watts) and voltage. Some current production 845 tubes have metal plates.
The triode and its derivatives (tetrodes and pentodes) are transconductance devices, in which the controlling signal applied to the grid is a voltage, and the resulting amplified signal appearing at the anode is a current. [31] By comparison the later bipolar junction transistor uses a small current to control a larger current.
In electronics, the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals. It measures 6.4 in (16 cm) high and 2.4 in (6.1 cm) wide, and the anode can dissipate 40 watts thermal.
The 1937 6F8G [2] was also an octal-based double triode with essentially the same characteristics as the 6SN7 (or two 6J5's), but in a 'Coke Bottle' large (Outline ST-12) glass envelope with a different pin arrangement and utilising a top cap connection for the first triode's grid (making pin 1 available for a metal shield).
By 1910 he developed this into the first real tube amplifier, by creating a triode. His invention of the triode is almost simultaneously created by the American Lee de Forest. Max Dieckmann and Gustav Glage use the Braun tube for playback of 20-line black-and-white images. The first jukebox with records comes on the market.