The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. In general, the KT88 tube has a magical mid-range similar to the smaller EL34 tube, but with low and high end extremes that reach much further. In some amplifiers the KT90, KT120 and KT150 are acceptable substitutes. However we advise you to check with the manufacturer of your KT88 amp to confirm before you try them...More Details
The KT88 was invented by Marconi-Osram Valve Co. and became quick competition for the USA made 6550 tube. Companies including Leak, McIntosh, Dynaco, and Harmon-Kardon all offered high-end amps that would take advantage of the KT88 tube's abilities. Marshall also got into the action a few years later when they released the 200 watt Marshall Major amplifiers.
Today, many high-end audio tube amp manufacturers still rely on the KT88 tube or one of its variants (KT90 and KT120) for their current production tube amplifiers. Companies such as Cary Audio, McIntosh, and Jolida offer amps with KT88 tubes. The current amplifiers from Audio Research and Conrad Johnson are designed to use the recently released Tung-Sol KT120. Rogue Audio and Quicksilver Audio offers amplifiers that can use any version of the KT88, KT90, or KT120. And this just scratches the surface.
We have a large selection of KT88, KT90, KT120, and KT150 vacuum tubes in stock with tube reviews submitted by our customers.
Be sure to click the “Additional Info” tab when viewing a specific KT88, KT90, KT120 tube. There you will find related articles and downloads such as datasheets, pin-outs, ratings, and matching information when available. Other excellent links for technical information can be found at KT88 in Wikipedia, KT88 in Duncan Amps, and KT88 in The Tube Directory.