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Utility Radio
The Utility Radio or Wartime Civilian Receiver was a valve domestic radio receiver, manufactured in Great Britain during World War II starting in July 1944. It was designed by G.D. Reynolds of Murphy Radio. Both AC and battery-operated versions were made. History When war broke out in 1939, British radio manufacturers devoted their resources to producing a range of military radio equipment required for the armed forces. This resulted in a shortage of consumer radio sets and spare parts, particularly valves, as all production was for the services. The war also prompted a shortage of radio repairmen, as virtually all of them were needed in the services to maintain vital radio and radar equipment. This meant it was very difficult for the average citizen to get a radio repaired, and with very few new sets available, there was a desperate need to overcome the problem. The government solved this by arranging for over forty radio manufacturers to produce sets to a standard design with a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wartime Civilian Receiver
Wartime may refer to: * Wartime, Saskatchewan, a small community in Saskatchewan, Canada * Wartime, a formal state of war, as opposed to peacetime * ''Wartime'' (film), a 1987 science fiction film spin-off of the TV series ''Doctor Who'' * ''Wartime: Understanding and Behavior in the Second World War'', a 1989 book by Paul Fussell Paul Fussell Jr. (22 March 1924 – 23 May 2012) was an American cultural and literary historian, author and university professor. His writings cover a variety of topics, from scholarly works on eighteenth-century English literature to commentar ... See also * {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal Rectifier
A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide, germanium or selenium. They were used in power applications to convert alternating current to direct current in devices such as radios and battery chargers. Westinghouse Electric was a major manufacturer of these rectifiers since the late 1920s, under the trade name Westector (now used as a trade name for an overcurrent trip device by Westinghouse Nuclear). In some countries the term "metal rectifier" is applied to all such devices; in others the term "metal rectifier" normally refers to copper-oxide types, and " selenium rectifier" to selenium-iron types. Description Metal rectifiers consist of washer-like discs of different metals, either copper (with an oxide layer to provide the rectification) or steel or aluminium, plated with selenium. The discs are often separated by spacer sleeves to provide cooling. Mode of operation The principle of operation of a met ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mazda (light Bulb)
Mazda was a trademarked name registered by General Electric (GE) in 1909 for incandescent light bulbs. The name was used from 1909 to 1945 in the United States by GE and Westinghouse. Mazda brand light bulbs were made for decades after 1945 outside the US. The company chose the name due to its association with Ahura Mazda, the transcendental and universal God of Zoroastrianism whose name means light of wisdom in the Avestan language. In 1909 the Mazda name was created for the tungsten filament light bulb. GE sold bulbs under this trademark starting in 1909. GE promoted the mark as identifying tungsten filament bulbs with predictable performance and life expectancy. GE also licensed the Mazda name, socket sizes, and tungsten filament technology to other manufacturers to establish a standard for lighting. Bulbs were soon sold by many manufacturers with the Mazda name licensed from GE, including British Thomson-Houston in the United Kingdom, Toshiba in Japan, and GE's chief compet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cossor
A.C. Cossor Ltd. was a British electronics company founded in 1859. The company's products included valves, radios, televisions and military electronics. The company was purchased by Raytheon in 1961. Early history The story of A.C. Cossor Ltd. began in 1859 when the company was established by Alfred Charles Cossor in Clerkenwell, London to manufacture scientific glassware. His eldest son, also called Alfred Charles Cossor joined the company in 1875, and it was he who founded the A.C. Cossor electronics company. The company's expertise in the manufacture of electrical glassware, such as early cathode ray tubes and X-ray tubes, led the company to diversify into electronics. The younger son Frank Cossor joined the company in 1885, and eventually took over the running of the original scientific glassware company which remains to this day as Accoson, a manufacturer of sphygmomanometers. Cossor, a go-ahead electronics firm, designed, and manufactured electronic thermionic valves, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi-Osram Valve
M-OV (Marconi-Osram Valve Company) was a British manufacturer of thermionic valves (vacuum tubes). It was a subsidiary of the (British) General Electric Company Ltd. The company was founded in 1919, when the valve making interests of GEC (Osram) and the Marconi Company were combined. In 1929, Marconi sold its interest in the company to the Gramophone Company, a predecessor of EMI. In 1939, M-OV acquired two disused cotton mills at Shaw, Oldham where it established a shadow factory to produce valves and cathode ray tubes. The two mills named Cape and Duke, were bought from the Lancashire Cotton Corporation for £7,000. Cape mill was used as the main production facility at Shaw, with the adjacent Duke mill remaining mostly unused. Shaw produced a vast array of valves for the war effort, some of which are listed below. * VT104 and VT105 for the T1154 transmitter. * VR99, VR100, VR101 and VR103 for the R1155 receiver. * TT11 for the TR1143 fighter set. * VT90 micropup used i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mullard
Mullard Limited was a British manufacturer of 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 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, 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 valves (vacuum tubes) produced in this period were named with the prefix PM, for Philips-Mullard, beginning with the PM3 and PM4 in 1926. Mullard fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Valve Association
The British Radio and Valve Manufacturers' Association (BVA) was a 20th-century cartel of vacuum tube A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. The type kn ... (valve) manufacturers in the United Kingdom of Great Britain and Northern Ireland (UK) that was designed to protect their interests from foreign competition. This cartel dictated (among other things), the price of valves (vacuum tubes) and how they were numbered. The numbering scheme was supposedly designed to make it difficult to identify American equivalents, which were typically half the retail price in their home country; however American types manufactured in the UK by companies such as Brimar sold at the same price as their UK counterparts due to the BVA's insistence. All manufacturers eventually published their own lists of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconiphone
Marconiphone was an English manufacturer of domestic receiving equipment, notably radio receivers and reel-to-reel tape machines. Early History After World War I, the Marconi Company began producing non-industrial receivers, principally for the amateur market, at the Soho premises of The Marconi Scientific Instrument Company. In 1922, the Marconi Company formed the "Marconiphone" department, to design, manufacture and sell domestic receiving equipment. This equipment complied with Post Office specifications and tests, and was therefore awarded the BBC authorisation stamp; initially sets were made at the Chelmsford Works. In December 1923, the 'Marconiphone' department was formed as a subsidiary of the Marconi Company. Some Marconiphone Company sets were made at the Sterling Telephone Company (STC) Works at Dagenham. However, design and research of these domestic receivers still continued at Chelmsford. Gramophone Company In December 1929, the Marconiphone was sold to the Gram ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pye Ltd
Pye can refer to: Businesses * Pye (electronics company), British electronics manufacturer * Pye Records, British record label ** Pye International Records, a subsidiary People * Pye (surname) * Pye Dubois, musician * Pye Hastings, musician * Pye Min (1619-1672), king of Toungoo dynasty, Burma Other uses *Pye (Osnabrück district), a district of the city of Osnabrück, Germany *''Ginger Pye'', a 1951 novel by Eleanor Estes * ''Mr Pye'', a 1953 novel by Mervyn Peake * Pye baronets, two titles in the Baronetage of England * Pye Bridge railway station, formerly at Pye Bridge, Derbyshire * Pye Road, an ancient Roman road in what is now England * Pye Corner in the City of London, location of the Golden Boy of Pye Corner * Pye Corner railway station, station in Newport, South Wales * Pye, the name of an owl in the Guardians of Ga'Hoole ''Guardians of Ga'Hoole'' is a fantasy book series written by Kathryn Lasky and published by Scholastic. The series contains a total of 16 books ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferrite Core
In electronics, a ferrite core is a type of magnetic core made of ferrite on which the windings of electric transformers and other wound components such as inductors are formed. It is used for its properties of high magnetic permeability coupled with low electrical conductivity (which helps prevent eddy currents). Because of their comparatively low losses at high frequencies, they are extensively used in the cores of RF transformers and inductors in applications such as switched-mode power supplies, and ferrite loopstick antennas for AM radio receivers. Ferrites Ferrites are ceramic compounds of the transition metals with oxygen, which are ferrimagnetic but nonconductive. Ferrites that are used in transformer or electromagnetic cores contain iron oxides combined with nickel, zinc, and/or manganese compounds. They have a low coercivity and are called "''soft ferrites''" to distinguish them from "''hard ferrites''", which have a high coercivity and are used to mak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intermediate Frequency
In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process called heterodyning, resulting in a signal at the difference or beat frequency. Intermediate frequencies are used in superheterodyne radio receivers, in which an incoming signal is shifted to an IF for amplification before final detection is done. Conversion to an intermediate frequency is useful for several reasons. When several stages of filters are used, they can all be set to a fixed frequency, which makes them easier to build and to tune. Lower frequency transistors generally have higher gains so fewer stages are required. It's easier to make sharply selective filters at lower fixed frequencies. There may be several such stages of intermediate frequency in a superheterodyne receiver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philips
Koninklijke Philips N.V. (), commonly shortened to Philips, is a Dutch multinational conglomerate corporation that was founded in Eindhoven in 1891. Since 1997, it has been mostly headquartered in Amsterdam, though the Benelux headquarters is still in Eindhoven. Philips was formerly one of the largest electronics companies in the world, but is currently focused on the area of health technology, having divested its other divisions. The company was founded in 1891 by Gerard Philips and his father Frederik, with their first products being light bulbs. It currently employs around 80,000 people across 100 countries. The company gained its royal honorary title (hence the ''Koninklijke'') in 1998 and dropped the "Electronics" in its name in 2013, due to its refocusing from consumer electronics to healthcare technology. Philips is organized into three main divisions: Personal Health (formerly Philips Consumer Electronics and Philips Domestic Appliances and Personal Care), Connecte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
