Gold Lion ECC81 / B739 / 12AT7 Preamp Vacuum TubeOriginal Genalex Gold Lion ECC81 B739 vacuum tubes are considered the best 12AT7 preamp tube types ever made. They are also among the rarest types available. They exhibit a large, detailed soundstage characterized by an expressive midrange, deep tight bass, and a smooth extended high end. The reissue Genalex Gold Lion ECC81 B739 recreates the sound signature of the original. This tube features balanced sections and gold plated pins. Moon Audio Tube