my Japanese 505 - flawless, sold it within 1 day, (multiple offers) to upgrade to the 550. I believe my converter failed with the 550 after about a year but not sure but the unit wouldn’t turn on.
I sent it to George Meyer in LA for repair. They said that it was a Luxman fault not the converter. Then UPS lost it on its way back to me.😫
I purchased the 550 new off Eb.. for $3800 including import fees.
repair and shipping to GM =$1100 = $4900 vs 7K new.
I would definitely buy another Japanese version but use a higher quality converter.
I gotta say that it took a while to find a tech that could work on it here in the states.
I also saw on another resale site that they were able to convert a 100 v to 120 on a 505 but it couldn’t be done on the 550.
Luxman explicitly states they won’t service products mfg elsewhere. So no warranty.