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- KT66 abstract "KT66 is the designator for a beam tetrode vacuum tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937.The KT66 is the direct descendant of the "Harries Valve" developed by British engineer J. Owen Harries and marketed by the Hivac Co. Ltd. in 1935. Harries is believed to be the first engineer to discover the "critical distance" effect, which maximized the efficiency of a power tetrode by positioning its anode at a distance which is a specific multiple of the screen grid-cathode distance. This design also minimized interference of secondary emission electrons dislodged from the anode.EMI engineers Cabot Bull and Sidney Rodda improved the Harries design with a pair of beam plates, connected to the cathode, which directed the electron streams into two narrow areas and also acted like a suppressor grid to deflect some secondary electrons back to the anode. The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe. Because this overall design eliminated the "tetrode kink" in the lower parts of the tetrode's voltage-current characteristic curves (which sometimes caused tetrode amplifiers to become unstable), M-OV marketed this tube family as the "KT" series, standing for "kinkless tetrode".A number of different KT tubes were later marketed by M-OV. Some, but not all, were versions of existing American beam tetrode tubes or European power pentodes, such as the KT66 (6L6), KT77 (EL34 and 6CA7), KT88 (6550), and KT63 (6V6).Although the RCA 6L6 of 1936 (the result of a license agreement between RCA and M-OV) was the first true "beam power tube" on the market, the later KT66 became almost equally famous, at least in Europe. The two tubes were nearly interchangeable, except that the KT66 was somewhat more rugged than the early metal 6L6.The KT66 was very popular in European radios and audio amplifiers. It was the standard output tube in the classic Quad II (1952, a version of which is still being manufactured today) and in the LEAK Type 15 (1945) and TL/12 (1948), both among the earliest British hi-fi amplifiers. Because of their excellent electrical characteristics and overload tolerance, KT66s are preferred by some guitar players for use in guitar amps in place of 6L6GC. However, the plate dissipation of the 6L6GC, at 30W, exceeds the KT66's 25W, and adjustment of the amplifier's bias is necessary.M-OV ceased glass vacuum tube manufacture in 1988; their old audio tube types became valuable collectibles[citation needed]. In 2004 original M-OV KT66 tubes (bearing the official "Genalex" marketing brand that M-OV used outside the UK), unused in original carton, sold for US$250. As of 2012 KT66 tubes continued to be manufactured at Reflektor Saratov in Russia, JJ Electronics in Slovakia, and at Liuzhou in China.Some modern Russian manufacture Sovtek KT66 tubes are actually 6L6GC tubes in a KT66 style bottle. While these tubes have the same pinout and minimum tolerances required of a KT66 tube, they do not have the performance characteristics of a true kinkless tetrode KT66 tube.By contrast the very latest Russian manufactured tubes (2012) not only carry the same internal electrode structure as the original KT66 (they now look the same) they also have the same rugged electrical characteristics and can with stand a high voltage on grid 2 comparable to the anode voltage rating, allowing greater power output afforded by higher voltage capability when run in ultralinear connection.".
- KT66 thumbnail KT66_tube.jpg?width=300.
- KT66 wikiPageExternalLink sheetsK.html.
- KT66 wikiPageID "990247".
- KT66 wikiPageRevisionID "604433227".
- KT66 cathodeType "Indirectly heated".
- KT66 classAAnodeCurrent "85.0".
- KT66 classAAnodeResistance "22".
- KT66 classAAnodeVoltage "250".
- KT66 classABiasVoltage "-15".
- KT66 classAbAnodeCurrent "62.5".
- KT66 classAbAnodeVoltage "400".
- KT66 classAbBiasVoltage "-38".
- KT66 classAbLoadResistance "4".
- KT66 classAbScreenVoltage "400".
- KT66 classification "Beam-Power Tetrode".
- KT66 hasPhotoCollection KT66.
- KT66 heaterCurrent "1.27".
- KT66 heaterVoltage "6.3".
- KT66 lassAScreenVoltage "250".
- KT66 maxDissipation "50".
- KT66 maxVoltage "500".
- KT66 pinout "Octal Base,".
- KT66 pinout "Pin 1, Not Used".
- KT66 pinout "Pin 2, Heater".
- KT66 pinout "Pin-3, Anode/Plate".
- KT66 pinout "Pin-4, Screen Grid, g2".
- KT66 pinout "Pin-5, Control Grid, g1".
- KT66 pinout "Pin-6, Not Used".
- KT66 pinout "Pin-7, Heater".
- KT66 pinout "Pin-8, Cathode-Beam Plates".
- KT66 reference "Radio Valve Data, Eighth Ed. Ilife Books Ltd., London, 1966".
- KT66 reference "Super Radiotron Valve Manual, Amalgamated Wireless Valve Co. Australia, June 1962".
- KT66 service Amplifier.
- KT66 service "Class AB1 amplifier,".
- KT66 service "Class AB2 amplifier,".
- KT66 transconductanceGm "6300".
- KT66 subject Category:1937_introductions.
- KT66 subject Category:Guitar_amplification_tubes.
- KT66 subject Category:Vacuum_tubes.
- KT66 comment "KT66 is the designator for a beam tetrode vacuum tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937.The KT66 is the direct descendant of the "Harries Valve" developed by British engineer J. Owen Harries and marketed by the Hivac Co. Ltd. in 1935.".
- KT66 label "KT66".
- KT66 label "KT66".
- KT66 sameAs KT66.
- KT66 sameAs m.03x5m1.
- KT66 sameAs Q6338449.
- KT66 sameAs Q6338449.
- KT66 wasDerivedFrom KT66?oldid=604433227.
- KT66 depiction KT66_tube.jpg.
- KT66 isPrimaryTopicOf KT66.