IIRC, Japan uses 100v AC so you will probably need a transformer. But some gear has universal current adaptability.
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Your best alternative to the Step down route, is to purchase a Buck/Boost transformer to 'buck' the 117/120 voltage down to 100 voltage. It has to be matched for wattage and amperage to the Yamaha unit. I use one for my Accuphase units. You could wire it yourself,(or ask an electrician) all come with instructions in the box
and the transformers can be found on Ebay all the time.
"No need to use one, as it always hampers the performance."
Everytime I see an ad for Japanese gear for sale in the US, the ad always states something like "Just use a step down transformer. Does not hamper performance and can be found cheap on ebay."
Elberoth, do you have much experience in this? I'm asking as I was looking at some Accuphase & Luxman integrated amps. Many thanks.