I think you are right, the 128k and 512k can not be made to work on 220V ...
Looks like the Plus and latest had that universal PSU, like SE that got 240V
Picture of the 128k board
thanks for clearing that ... only way to work 110V mac on 220V is to replace the analog board or buy stepdown transformer
Looks like the Plus and latest had that universal PSU, like SE that got 240V
Picture of the 128k board
thanks for clearing that ... only way to work 110V mac on 220V is to replace the analog board or buy stepdown transformer