It is not mostly a power supply issue in audio equipment and some radio equipment, rather it has to do with the harmonic content getting past the filtering that is designed to stop the ripple and noise from standard mains power. In addition, the motors in some tape machines and most turntables do not like the power with all of the harmonic content. And I am aware that some use DC motors and a very few use servo motors. Those are either the very cheap ones or the very expensive ones.Really? Why?
Audio amplifier power supplies are full of huge current pulses due to connecting the sinewave from a transformer to an oversized smoothing capacitor.