Unison Research for more than 20 years has been admire and appreciate around the world. From very beginning our purpose has always been to provide enjoyment throught listening to music. To that deceptively simple goal we bring a lifetime of experience in both valve and hybrid electronics design - and a genuine passion for making equipment that will give lasting pleasure. All Unison Research products at Solid State Audio come with full factory warranty. Unison Research from dedicated specialist Solid State Audio.