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Ordinary pentodes are referred to as sharp-cutoff or high-slope pentodes and have uniform aperture size in the control grid. The uniform construction of the control grid results in the amplification factor (mu or μ) and transconductance changing very little with increasingly negative grid voltage, resulting in fairly abrupt cutoff of plate ...
The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval (B9A) base for audio-frequency applications. It was introduced by the Mullard company in 1953 [2] and was produced by Philips, Mullard, Telefunken, Valvo, and GEC among others. It is very similar electrically to the octal base EF37A and the Rimlock base EF40.
1A4-p – Remote-cutoff pentode; 1A4-t – Remote-cutoff tetrode; 1A6 – Pentagrid converter up to only 10 MHz due to low heater power (2 V/60 mA) and consequent low emission in the oscillator section; also occasionally used as a grid-leak detector; 1B4-p – Sharp-cutoff pentode; 1B4-t – Sharp-cutoff tetrode; 1B5 – Dual detector diode ...
In electronics, cut-off is a state of negligible conduction that is a property of several types of electronic components when a control parameter (that usually is a well-defined voltage or electric current, but could also be an incident light intensity or a magnetic field), is lowered or increased past a value (the conduction threshold).
EF50. In the field of electronics, the EF50 is an early all-glass wideband remote cutoff pentode designed in 1938 by Philips.It was a landmark in the development of vacuum tube technology, departing from construction techniques that were largely unchanged from light bulb designs. [1]
Skid-steer loaders are sometimes equipped with tracks instead of the wheels, and such a vehicle is known as a compact track loader. [7] Skid steer loaders, both wheel and track models, operate most efficiently when they are imbalanced – either the front wheels or the back wheels are more heavily loaded.
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 screen or helix of fine wire surrounding the cathode, and is surrounded in turn by ...
The 6AK5 vacuum tube is a miniature 7-pin sharp-cutoff pentode used as RF or IF amplifier especially in high-frequency wide-band applications at frequencies up to 400 MHz. It was developed by Bell Labs / Western Electric and used extensively as an I.F. amplifier in World War II radar systems. The tube is notable for its extremely fine grid, and ...
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