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The Unison Research S2K is a 15 watt per channel single ended intergrated amplifier that is handcrafted in Italy. This unit use 2 12AU7 and 2 KT88 in a SingleEnded Ultra Linear Class A design. Pure silver is used for the printed circuit board and all hand wiring connections, inside had upgrade to auricap.Enclosed 2 national 6550 and telefunken 12au7 , I am the second owner and been serve me well, only problem is the cage on the left side had a dent. Please let me know any questions, shipping will be buyers expense, the unit is heavy but I can pack well. Local pick up is always welcome.