is also available - 6P14P-EV (Cyrillic: 6П14П-ЕВ) and is known among US guitar players as "EL84M" or the "Russian military EL84". While not necessarily a true "military version" of the tube (in fact it is more comparable to the 7189), 6P14P-EVs are known for their low noise and durability. Large NOS (New Old Stock) supplies of the tube are available. The 6GK6 has nearly equivalent operating characteristics with a different pinout. the tube was manufactured in Russia (Sovtek, Electro-Harmonix, Tung-Sol, Mullard and Genalex Gold Lion brands), Slovakia- Čadca (JJ Electronic) and China (Psvane brand made by Hengyang Electronics). The Sovtek EL84 is often sold under their own brand name by other well-known electric guitar and guitar amplifier manufacturers - such as Fender or Mesa Boogie. Also see 6P1P. PL84, UL84, and EL86 Although RCA and Sylvania produced the 8BQ5 and 10BQ5 as exact equivalents to the 6BQ5/EL84 other than heater voltage/current, most variants of the EL84 (e.g. the 15CW5/PL84) for series-heater applications such as television receivers (where it was most economical to directly-rectify the mains) made slight changes to the geometry of the original EL84 design to optimise performance for the slightly lower power supply voltages. When a 6.3V heater version of the PL84 was needed, the type number EL86 was assigned; the EL86 and PL84 are therefore very similar to, but not exactly identical to, the original EL84. Characteristics Note: Specifications given for the EL84, PL84, and UL84 are from Philips; RCA and Sylvania list slightly higher voltage ratings for Va and Vkf and lower for Vg2 for the xCW5 series - the 6CW5/EL86, 8CW5/XL86, 10CW5/LL86, 15CW5/PL84, and 30CW5/HL84. References External links - EL84 data at TDSL. Vacuum tube datasheet archive Reviews of EL84/6bq5 tubes. See also List of vacuum tubes Vacuum tubes Guitar amplification tubes