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Structure of a modern low-power triode vacuum tube. The glass and outer electrodes are shown partly cut away to reveal the construction. Schematic symbol used in circuit diagrams for a triode, showing symbols for electrodes.
Schematic symbol used in circuit diagrams for a vacuum tube, showing control grid. The control grid is an electrode used in amplifying thermionic valves (vacuum tubes) such as the triode, tetrode and pentode, used to control the flow of electrons from the cathode to the anode (plate) electrode. The control grid usually consists of a cylindrical ...
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
The TWT is an elongated vacuum tube with an electron gun (a heated cathode that emits electrons) at one end. A voltage applied across the cathode and anode accelerates the electrons towards the far end of the tube, and an external magnetic field around the tube focuses the electrons into a beam. At the other end of the tube the electrons strike ...
The 807 design (with some "value engineering" to reduce production cost) was the basis for the first application-specific horizontal sweep tubes such as the 6BG6G and 6CD6G. The redesign mainly involved the omission of some of the internal RF shielding, and the substitution of a bakelite octal base for the micanol or ceramic 5-pin.
Schematic of the Mission Bell model 19 car radio. One of the few radios produced in the United States to use a Wunderlich detector (type 70). "Questions about the 'Wunderlich' Tubes by Arcturus". Radiomuseum.org discussion page about Wunderlich tubes. "Vacuum Tubes, Inc". Vacuum Tubes Inc. article about Wunderlich tubes.
Cutaway diagram of a triode vacuum tube, showing the plate (anode) The plate from an EL84 pentode tube widely used in audio amplifiers in 1960s era radios and televisions, and still used in guitar amplifiers Schematic symbol used in circuit diagrams for vacuum tube, showing plate
A tetrode is a vacuum tube (called valve in British English) having four active electrodes. The four electrodes in order from the centre are: a thermionic cathode, first and second grids, and a plate (called anode in British English). There are several varieties of tetrodes, the most common being the screen-grid tube and the beam tetrode.