TubeA 2-channel tube amplifier is an audio amplifier that uses vacuum tubes to amplify the audio signal. Unlike solid-state amplifiers, which use transistors, tube amplifiers.FilterBrands All brands Margules Audio Rogue Audio 3 ProductsShow:12243672VanTotSort by:Sort byDefaultMost viewedNewest ProductsLowest priceHighest priceName ascendingName descendingAdd to cartLogin for wishlistMargules Audio U-280SC 30th Anniversary Limited Edition Tube Stereo Amplifier$12,000.00 Add to cartLogin for wishlistRogue Audio ST 100 Stereo Amplifier$3,995.00 Add to cartLogin for wishlistRogue Audio Atlas Magnum III Power Amplifier$2,995.00