To add to what Rodman said, what voltage are they? If not US, they will need a step/up transformer.
new marantz sc7 and sm7 system I bought from Japan in 1979.
I bought this system in Japan when I was stationed in Japan in the Air Force. The system is brand new with all the originally papers and manuals and boxes. I also have the ST5 digital tuner that I bought from Japan. It has been boxed and sealed since 1982 and never been out the box since. What is the value of the Sc7 and the sm7 now? I paid 180,000 yen for the sc7 and slightly less for the sm7 in Japan.