Definition, Betydelse & Anagram | Engelska ordet PENTODE

Definition av PENTODE

1. (elektronik) pentod

Exempel på hur man kan använda PENTODE i en mening

• Developed from Lee De Forest's 1906 Audion, a partial vacuum tube that added a grid electrode to the thermionic diode (Fleming valve), the triode was the first practical electronic amplifier and the ancestor of other types of vacuum tubes such as the tetrode and pentode.
• 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 suppressor grid is used in the pentode vacuum tube, so called because it has five concentric electrodes: cathode, control grid, screen grid, suppressor grid, and plate, and also in other tubes with more grids, such as the hexode.
• The beam tetrode produces greater output power than a triode or pentode with the same anode supply voltage.
• That also reduces the potential voltage amplification obtainable from a triode compared with a pentode of the same transconductance, and usually means a more efficient output stage can be made using pentodes, with a lower power drive signal.
• They proposed a cascade of two triodes (the first one with a common cathode setup, the second one with a common grid) as a replacement for a pentode, and so the name may be assumed to be an abbreviation of "casc(aded triode amplifier having characteristics similar to, but less noisy than, a single pent)ode".
• The capacitance of the grid condenser is chosen to be around ten times the grid input capacitance and is typically 100 to 300 picofarads (pF), with the smaller value for screen grid and pentode tubes.
• Although power pentodes and beam tetrodes have some differences in their principles of operation (the beam forming plates of the beam tetrode or fifth electrode (3rd grid) of the pentode, both serving to hinder the return of unabsorbed electrons from the anode (or plate) to the 4th electrode (2nd grid)) and have some internal construction differences, they are functionally closely equivalent.
• For example, the 12BH7 (double triode with separate cathodes) counts the center tapped heater as one useful element, whereas the 12BY7 (pentode) counts the center tapped heater as two useful elements.
• SO-118 (Triode), SO-122 (Power pentode), SO-124 (Tetrode) (Russian: СО-118, СО-122, СО-124) 4-volts indirectly heated tube set for premium radios.
• Following the voltage letter, "A" stands for a low-current (signal) diode section, "B" for a double diode with common cathode section, "C" for a triode section, "F" for a pentode section, "H" for a hexode or heptode section, and "L" for a power tetrode or pentode section.
• the E55L, a broadband power pentode used as the output stage of oscilloscope amplifiers and the E90CC, a dual triode with a common cathode connection and seven pin base for use in cathode-coupled Flip-flops in early computers.
• The 5C1 circuit was extraordinarily simple, using one 6SJ7 pentode in the preamplifier section to provide a single stage of voltage amplification, one 6V6 beam power tetrode in the power amplifier section, a 5Y3 rectifier tube and a single volume knob with no tone controls.
• He developed the theory of transverse joints in waveguide systems, proposed a number of methods for design and analysis of triode, tetrode, pentode, klystron, platinotron, magnetron and reznatron amplifiers and oscillators, carried out studies of surface electromagnetic waves.
• DF703 (5886) – Subminiature electrometer pentode, envelope has a moisture-repellent coating, all-glass wire-ended, for probe amplifiers.

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