Search results
Results from the WOW.Com Content Network
A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. The pentode contributed to the electronic preponderance of the Allies. The Colossus computer and the Manchester Baby used large numbers of EF36 pentode tubes.
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]
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).
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 ...
P (Russian: П) – Output pentode or beam tetrode. J (Russian: Ж) – Sharp-cutoff pentode (also transliterated zh, sh or j). K (Russian: К) – Variable-mu / remote-cutoff pentode. R (Russian: Р) – Double pentode or double tetrode. G (Russian: Г) – Combined triode-diode. B (Russian: Б) – Combined diode-pentode.
EF41/6CJ5 (62VP) – Remote-cutoff pentode, EF4, EF22/7B7 or EF39/6K7 with a Rimlock base; EF42 – Pentode, EF52 with a Rimlock base; EF43 – Remote-cutoff pentode; EF50 (EF53) – Remote-cutoff pentode for use in the IF stages of 1940s TV and radar receivers, B9G 9-pin Loctal base ; EF51 – Remote-cutoff pentode; EF52 – Pentode, EF42 with ...
Examples of this format are "PL302" and "EF183". From about the start of the 1960s an extra digit was needed for new devices. Either a digit 1 was inserted before the 8 or other base-defining digit (e.g. an EF184 is a Noval pentode), or a three-digit sequence was used. For example, a PL500 is a power pentode in a Magnoval base.
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 ...