I had bought a 100v version of the F 25 Accuphase crossover. I had also been told that this was OK for 120v and have been using it that way for nearly a year.
However, prompted by this article, I took off the bottom plate and their is a guide, as stated by Alan Hsu above, which has a legend adjacent to the power supply leads that shows how to exchange the leads to get different voltages. In my case, it was to exchange the positions of the yellow/orange wire and red wire to get 120v operation rather than 100v. The leads were quite similar to the illustrations at the site shown by Alan above. I am not concerned by warranty, because I am sure my unit has none anyway since it is a labelled 100v version in the USA.
The unit never actually ran too hot, but it was warm before, and is cool running now. The balance of the sound shifted slightly, but it always sounded great, even at 100v.
However, prompted by this article, I took off the bottom plate and their is a guide, as stated by Alan Hsu above, which has a legend adjacent to the power supply leads that shows how to exchange the leads to get different voltages. In my case, it was to exchange the positions of the yellow/orange wire and red wire to get 120v operation rather than 100v. The leads were quite similar to the illustrations at the site shown by Alan above. I am not concerned by warranty, because I am sure my unit has none anyway since it is a labelled 100v version in the USA.
The unit never actually ran too hot, but it was warm before, and is cool running now. The balance of the sound shifted slightly, but it always sounded great, even at 100v.