@charles1dad From the manual:
"The AC power source for the Reference 75 SE amplifier should be capable of supplying 10 amperes for 100 or 120 volt units, or 5 amperes for 220 or 240 volt units. For the very best performance on 100 or 120 volt circuits, the Reference 75 SE should be connected to its own AC power circuit branch, protected by a 15 amp breaker."
As for the reasoning: "Why does Audio Research use a 20-amp connector? Dave Gordon, brand ambassador, told me: 'The 20A IEC connector makes a tighter connection than the 15A IEC. We also spent a fair amount of time comparing 20A power cords, and we think the 20A cord sounds better.'"
https://www.theabsolutesound.com/articles/audio-research-vt80se-power-amplifier
@noromance I’m swapping in a 20A female connector on my power cord to fit the 20A male on the amp.