Justin, the Luxman must have a few miles on it because I don't think its made anymore. Is it a tubed unit? It may be behaving perfectly normally. Try the loading (3 ohms, 40, 100) @ 3 and it should be fairly quiet at anything like a normal volume level. You may simply be hearing the noise floor of the unit when you crank the volume. Do try grounding everything properly as any phono stage because of all the gain has a certain amount of noise and will amplify any crap it picks up. I don't know much about Japanese electrical wiring but I think they are 60 cycles/ 105 volts so that shouldn't be the issue.