I bought a few of these to use with my system but ended up going another direction. Brand new in unopened packaging. A very versatile tube buffer and processor. - Can make a solid state system sound like a tube system. - Tube pre-amp with volume control. - 3D Holographic Sound can provide an amazing sound stage increase and is switchable(OFF/LOW/HIGH). Great reviews all over the place! http://www.enjoythemusic.com/magazine/equipment/0913/ifi_micro_itube_review.htm