For Hifi use, I'd pass on these. My mother , a pro organist, bought a large Allen organ in 1979 that came with a separate amp rack with 4 of these amps. Years ago one amp developed problems and I took it in for repair, then tested it briefly in an audio system. It was a disappointment sonically, and not in the league of their earlier tube amps which I own to this day, and cherish.