The KT120 and its successor the KT150 are current production tubes and are manufactured for Tung-Sol at their New Sensor Russian factory. And for those lucky enough to have heard this tube in action, it is without a doubt one of the finest sounding tubes available. Ultimately, only the EL519, the PL519 and the 6P45S were produced.Īlthough today only a handful of amplifiers implement this tube in their power stages, a few renowned designers, like Tim de Paravicini, recognized its talents. The higher the number, the newer the tube, and the higher the anode power dissipation. The 500 family of tubes includes the E-types - EL505 / EL509 / EL519 - and the P-types PL505 / PL509 / PL519. Its Russian equivalent is the 6P45S.Ī near equivalent, and substitute, the newer EL509 variant with octal base (no anode cap) was specially designed for use as a power amp tube. Today we encounter this tube and its variants in audio amplifier power output stages. Another application of the EL509 / PL509 is that of the amateur radio output stage. They would be found in large screen colour televisions with an EHT of around 25 kV and thus requiring considerable line drive power. This tube type is of late manufacture and probably the last to be produced before transistors took over the role. Type PL519 was first introduced in 1970 and was a line output valve, or sweep tube as they were known in America. as was the 6P6S, the Russian version of the lower-power 6V6. The tube was also produced in Russia under the designator 6P3S. The 6L6 became the most successful and most produced tube family in vacuum tube history. Other close equivalents also include the 7581A and the 7591A. Earlier variants included the 807 (1937), the 1625, the 6V6 and the 6BG6G (1946), a modified 807. RCA's later versions, included the 6L6G, 6L6GA, 6L6GB, 5881, 5932, 7027, and the final version 6L6GC which was the most powerful - rated at 30W plate dissipation. This choice of denomination came about because the sobriquet "KT", stood for "kinkless tetrode". They later did finally introduce it themselves, as the KT66. MOV had licensed the design to because their engineers did not feel the kinkless tetrode could be successfully mass-produced. MOV's innovative beam tetrode design also allowed RCA to circumvent Philips' pentode patent. At the time Philips had already developed and patented power pentode designs, which were rapidly replacing power triodes due to their greater efficiency. Other equivalent tubes are the 7189 and 7189A, an extended-ratings version of the tube for industrial applications, E84L (7320) long life, professional version with more than 10000 hours expected lifetime, and the directly equivalent 6P14P (Cyrillic: 6П14П) produced in the USSR by the Reflektor plant.ĦL6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936 under license from MOV, owned by EMI/GE. The CV2975 is the military designation (Common Valve) for EL84. of England that were designed to be "drop-in" substitutes. Other manufacturers followed with their versions, such as the N709 from General Electric Co. American and Japanese manufacturers might label their versions of the EL84 as "EL84/6BQ5" or "6BQ5/EL84" or simply " 6BQ5". The 1959 "Miniwatt" Technical Data book from Philips lists the 6BQ5 as the R.E.T.M.A. (American) name for the EL84 in its "Type Number Cross Reference",and hence an exact substitute. Developed by Philips in 1953 for use in the British Mullard 5-10 amplifier, the EL84 pentode tube, or commonly known as 6BQ5 in North America, was intended for use as an inexpensive alternative to the larger audio tubes of the time, such as E元4, 6L6, and KT66 power tubes.
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