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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.
Plate detector circuit with cathode bias. Cathode bias RC time constant three times period of lowest carrier frequency. C L is typically around 250 pF.. In electronics, a plate detector (anode bend detector, grid bias detector) is a vacuum tube circuit in which an amplifying tube having a control grid is operated in a non-linear region of its grid voltage versus plate current transfer ...
Schematic symbol used in circuit diagrams for a triode, showing symbols for electrodes. All triodes have a hot cathode electrode heated by a filament , which releases electrons, and a flat metal plate electrode (anode) to which the electrons are attracted, with a grid consisting of a screen of wires between them to control the current.
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 ...
807 tube pinout diagram. The 807 is a beam tetrode vacuum tube, widely used in audio-and radio-frequency power amplifier applications. Audio uses
In vacuum tube technology, HT or high tension describes the main power supply to the circuit, which produces the current between anode and cathode.It is also known as the plate supply or voltage, B battery supply, or simply labeled →B on circuit diagrams, from the days of battery powered circuitry.
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
Schematic representation of a cold cathode voltage-regulator tube 5651 Regulator tube in operation. A voltage-regulator tube (VR tube) is an electronic component used as a shunt regulator to hold a voltage constant at a predetermined level. Physically, these devices resemble vacuum tubes, but there are two main differences: