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EF50
In the field of electronics, the EF50 is an early all-glass wideband Cut-off (electronics)#Remote cutoff, 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. Initially used in television receivers, it quickly gained a vital role in British radar, and great efforts were made to secure a continuing supply of the device as Holland fell in World War II. The EF50 tube is a Tube socket#Other Loctals, 9-pin Loctal-socket device with short internal wires to nine short chromium-iron pins. The short wiring was key to making it suitable for Very high frequency, Very High Frequency (VHF) use. History Early tube construction Early vacuum tubes were built using light bulb techniques, which had been highly automated by the 1920s. In a standard light bulb of the era, the tungsten filament was supported on two metal rods, which were fastened tog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tube Socket
Tube sockets are Electrical connector, electrical sockets into which vacuum tubes (electronic valves) can be plugged, holding them in place and providing terminals, which can be soldered into the circuit, for each of the pins. Sockets are designed to allow tubes to be inserted in only one orientation. They were used in most tube electronic equipment to allow easy removal and replacement. When tube equipment was common, retailers such as drug stores had vacuum tube testers, and sold replacement tubes. Some Nixie tubes were also designed to use sockets. Throughout the tube era, as technology developed, sometimes differently in different parts of the world, many tube bases and sockets came into use. Sockets are not universal; different tubes may fit mechanically into the same socket, though they may not work properly and possibly become damaged. Tube sockets were typically mounted in holes on a sheet metal chassis and wires or other components were hand soldered to lugs on the unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentode
A pentode is an electronic device having five electrodes. The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. The pentode (called a ''triple-grid amplifier'' in some literature) was developed from the ''screen-grid tube'' or ''shield-grid tube'' (a type of tetrode tube) by the addition of a grid between the screen grid and the plate. The screen-grid tube was limited in performance as an amplifier due to secondary emission of electrons from the plate. The additional grid is called the ''suppressor grid''. The suppressor grid is usually operated at or near the potential of the cathode and prevents secondary emission electrons from the plate from reaching the screen grid. The addition of the suppressor grid permits much greater output signal amplitude to be obtained from the plate of the pentode in amplifier operation than from the plate of the screen-grid tube at the same plat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Tube
The 955 is typical of the acorn designs, named for the glass cap holding the terminals with the main part of the tube extending from it. An acorn tube, or acorn valve, refers to any member of a family of VHF/UHF vacuum tubes starting just before World War II. They were named after their resemblance to the acorn, specifically due to the glass cap at one end of the tube that looked similar to the cap on an acorn. The acorn tubes found widespread use in radios and radar systems. High-frequency performance is limited by (1) parasitic lead inductance and capacitance and skin effect, and (2) electron transit time (the time required to travel from cathode to anode). Transit time effects are complicated, but one simple effect is the phase margin; another one is input conductance, also known as grid loading. At extremely high frequencies, electrons arriving at the grid may become out of phase with those departing towards the anode. This imbalance of charge causes the grid to exhibit a re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RAF Bawdsey
Royal Air Force Bawdsey or more simply RAF Bawdsey is a former Royal Air Force station situated on the eastern coast in Suffolk, England. Also known as Bawdsey Research Station (BRS), the first Chain Home radar station was built there, characterized by eight tall masts, four for transmitting and four for receiving. When the research group moved to Dundee in September 1939, the radar station was left active under the name RAF Bawdsey. The site later hosted a Bristol Bloodhound surface-to-air missile station until 1990, with the station closing in 1991. History Bawdsey Manor, dating from 1886, was taken over in March 1936 by the Air Ministry for developing the Chain Home (CH) RDF (radar) system. The station's Superintendent was initially Robert Watson-Watt, later followed by A.P. Rowe. The experimental radar station was located just northeast of the Manor, about distant. When war was declared in September 1939, fears of a possible commando raid on the group led to the develo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward George Bowen
Edward George "Taffy" Bowen, CBE, FRS (14 January 1911 – 12 August 1991), was a Welsh physicist who made a major contribution to the development of radar. He was also an early radio astronomer, playing a key role in the establishment of radioastronomy in Australia and the United States. Early years Edward George Bowen was born at Cockett in Swansea, south Wales, to George Bowen and Ellen Ann (née Owen). George Bowen was a steelworker in a Swansea tinplate works. From an early age Bowen developed a strong interest in radio and cricket. He entered Swansea University and read physics and related subjects. He graduated with a first-class Honours degree in 1930, and continued with postgraduate research on X-rays and the structure of alloys, earning an MSc in 1931. He completed his doctorate under professor Edward Victor Appleton at King's College London. As part of his research, Bowen spent a large part of 1933 and 1934 working with a cathode-ray direction finder at the Ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Victor Appleton
Sir Edward Victor Appleton (6 September 1892 – 21 April 1965) was an English atmospheric physicist who received the Nobel Prize in Physics in 1947 "for his investigations of the physics of the upper atmosphere especially for the discovery of the so-called Appleton layer". Biography Appleton was born in Bradford, West Riding of Yorkshire, the son of Peter Appleton, a warehouseman, and Mary Wilcock, and was educated at Hanson Grammar School. In 1911, aged 18, he was awarded a scholarship to attend St John's College, Cambridge, where he graduated with First Class Honours in Natural Science with Physics in 1913. He was also a member of Isaac Newton University Lodge. In 1915 he married his first wife, Jessie Appleton (formerly Longson), with whom he had two children. Three years after her death he married Helen Lennie (m. 1965). During the First World War he joined the West Riding Regiment, and later transferred to the Royal Engineers. After returning from active serv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harold Pye
Harold may refer to: People * Harold (given name), including a list of persons and fictional characters with the name * Harold (surname), surname in the English language * András Arató, known in meme culture as "Hide the Pain Harold" Arts and entertainment * ''Harold'' (film), a 2008 comedy film * ''Harold'', an 1876 poem by Alfred, Lord Tennyson * ''Harold, the Last of the Saxons'', an 1848 book by Edward Bulwer-Lytton, 1st Baron Lytton * ''Harold or the Norman Conquest'', an opera by Frederic Cowen * ''Harold'', an 1885 opera by Eduard Nápravník * Harold, a character from the cartoon ''The Grim Adventures of Billy & Mandy'' *Harold & Kumar, a US movie; Harold/Harry is the main actor in the show. Places ;In the United States * Alpine, Los Angeles County, California, an erstwhile settlement that was also known as Harold * Harold, Florida, an unincorporated community * Harold, Kentucky, an unincorporated community * Harold, Missouri, an unincorporated community ; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dipole Antenna
In radio and telecommunications a dipole antenna or doublet is one of the two simplest and most widely used antenna types, types of antenna; the other is the monopole antenna, monopole. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each far end. A dipole antenna commonly consists of two identical conductive elements such as metal wires or rods. The driving current from the transmitter is applied, or for receiving antennas the output signal to the radio receiver, receiver is taken, between the two halves of the antenna. Each side of the feedline to the transmitter or receiver is connected to one of the conductors. This contrasts with a monopole antenna, which consists of a single rod or conductor with one side of the feedline connected to it, and the other side connected to some type of g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AI Mk
AI most frequently refers to artificial intelligence, which is intelligence demonstrated by machines. Ai, AI or A.I. may also refer to: Animals * Ai (chimpanzee), an individual experimental subject in Japan * Ai (sloth) or the pale-throated sloth, a northern Amazonian mammal species Arts, entertainment and media Works * Ai (album), ''Ai'' (album), a 2004 release by Seraphim * A.I. (song), "A.I." (song), by OneRepublic, 2016 * ''A.I. Artificial Intelligence'', a 2001 American film * ''A.I. Rising'', a 2018 Serbian film * ''AI: The Somnium Files'', a 2019 video game * ''American Idol'', a televised singing contest * ''The American Interest'', a bimonthly magazine (2005–2020) * I (2015 film), ''I'' (2015 film), an Indian Tamil film (initial title: ''Ai'') Other uses in arts and media * A.i. (band), a Californian rock–electroclash group * All in (poker), wagering one's entire stake * Appreciation Index, a British measure of broadcast programme approval * Non-player character, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mullard
Mullard Limited was a British manufacturer of electronics, electronic components. The Mullard Radio Valve Co. Ltd. of Southfields, London, was founded in 1920 by Captain Stanley R. Mullard, who had previously designed thermionic valves (US term: vacuum tube) for the Admiralty before becoming managing director of the Z Electric Lamp Co. The company soon moved to Hammersmith, London and then in 1923 to Balham, London. The head office in later years was Mullard House at 1–19 Torrington Place, Bloomsbury, now part of University College London. Start-up In 1921, the directors were Sir Ralph Ashton (chairman), Basil Binyon of the Radio Communication Co, Cyril Frank Elwell, C.F. Elwell and S.R. Mullard (managing director). Partnership with Philips In 1923, to meet the technical demands of the newly formed BBC, Mullard formed a partnership with the Dutch manufacturer Philips. The vacuum tube, valves (vacuum tubes) produced in this period were named with the prefix PM, for Philip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASV Mk
ASV may refer to: * Aberdeen Sports Village, a sports facility in Aberdeen, Scotland * Adaptive servo-ventilation, a treatment for sleep apnea * Adaptive Support Ventilation, a mode of ventilation for critical care patients * Air-to-surface-vessel radar (also "anti-surface vessel"), aircraft-mounted radars used to find ships and submarines * American Society for Virology * American Standard Version, a translation of the Bible released in 1901 * Amplicon sequence variant, a term used to refer to individual DNA sequences recovered from a high-throughput marker gene analysis * Anodic stripping voltammetry, a voltammetric method for quantitative determination of specific ionic species * Armeesportvereinigung Vorwärts, a former East Germany military sports club * M1117 armored security vehicle, an armored fighting vehicle produced by Textron * Ascot Vale railway station, Melbourne * Asociación de Scouts de Venezuela, the Scouts Association of Venezuela * Astronomical Society of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
