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Just a plain wonderful preamp It takes a little getting used to because it will sound better than most anything you have heard I like this solid state preamp more than most of Audio Researches Tube preamps It's hard to explain, it just makes the music feel good without dulling itThe hybrid SP9 MkII uses two 6DJ8 tubes, one in the phono stage and one in the line section, each ringed with tube dampers, like the solitary 6DJ8 in the ARC SP14 The SP9 MkII is a revision of the original SP9 introduced in the Summer of 1987, embodying what Audio Research calls a group of 14 different improvements JMH8712 Description of the Audio Research SP9 Ebayhttp//cgiebaycom/ws/eBayISAPIdll?ViewItem&item= Audio Research Sp14 Preamplifier Www Pinterest Com 0bvuc9ca1gm03at Audio Design Audio Hifi Audio Audio research sp14 preamp for sale