Luxman Knockoffs or Counterfeits?

Try contacting albertportis.  He has a knack for finding people what they want: new, previously owned, demo, etc.  He is a great person and extremely fair with his prices.

This reference to “counterfeits” is a red herring. To my knowledge there have never been reports of Luxman counterfeits, which would be fakes produced by a company other than Luxman. 
 

Duh, differs countries have different electrical requirements- guess what, it’s been that way forever. Buy the model made for your country. But don’t call the others counterfeits 

A heck of a lot of people use voltage transformers successfully. The only issue is really cheap ones may hum.

My JVC Victor TT81 is 100V. I got a decent inexpensive 120/100 transformer. 120 comes from my Furman P18000 which has tremendous capacitor reserves; then to transformer 120/100 to TT.

My Luxman amp is 120v, but I would not hesitate to use a 100 v unit if either a good deal, or they are hard to find.

My only concern is if I forget and plug it into 120v by error

I can see OP dilemma over price disparities between US and Japan. When you see similar items from Japan priced 25-30% lower than US counterparts, it’s can be very enticing. But as @jjss49 pointed out, consider all those points before buying from Japan. Not to mention, you will have a tough time reselling the Japanese model in US.

Personally, I will never buy any grey market electronics that requires voltage conversion to operate properly.

Buyer beware, I thought I found a deal on a pair of speakers from Japan. Did my due diligence. In the end it it turned out to be a scam. The sellers know this, send me your money and they are gone. Especially on a larger ticket item. Us laws don’t apply!!! Not to mention shipping costs, damage issues, etc. if you really want it , buy it. Don’t complain if you got taken. I wouldn’t do it.