You have to replace motor and usually pedal too. If it has a Singer lamp, they are identical for either Voltage, except the bulb. I think there are step up converters, a small square box to go from 110V to 220V. They can be found many places where they sell electrical equipment and is the easy way about it. Here step down is the most common challenge, but I'm sure it's standard procedure in the US. From what I have heard, a 22V motor often runs with US 110V, but very slowly. A 99 is not a particuarly slow machine, it stitches along speedy enough for most jobs.
Last edited by Mickey2; 12-03-2017 at 09:29 AM.