The Audio Innovations 500 is the kind of amp that makes you question everything you thought you knew about hi-fi. Released in the late ‘80s, it was part of a movement that brought tube amps back from the dead, proving that low power, high-quality Class A valve designs could still wipe the floor with over-engineered solid-state brutes. If you’ve ever wondered what pure musicality sounds like, this 25-watt, EL34-powered beauty is your answer.

S/N: 55517