The Clones guiding principles: Musical passion above all, striking sonic performance in every genre, superb value, and timeless design. The Clones AP1 combines first-class sound quality with flexibility, style and excellent value. It uses a very simple and direct circuit combining the CLONES values of musicality and power with flexibility and value. The music has areas of openess and honesty that considerably more expensive valve pre-amps do not reveal in quite the same manner. A true bargain. Clones offers an amazing 5 year limited warranty on their products.