Hi, Lini. Another member suggested I PM you. I have a Dual 1019 which I just brought from the US to a 220v country, unsure about which wire I am supposed to move. I think I just move the black wire from 1 to 3. Details are at http://audiokarma.org/forums/index.php?threads/dual-1019-convert-110v-to-220v.810678/#post-11337672. Do you have any wisdom to share on this?