How to change voltage on Thorens TD126 MkIII

I have a 220V Thorens TD126 MKIII I bought while stationed in England in 1980. It's been stored since 1982 when I returned to the US. Now I'm interested in using it again but I don't know how to change the voltage. It has a 50hz/60hz labeled switch under the platter for changing cycles & I wondered if it also changes voltage? The owners manual doesn't mention the switch. Any ideas or service technicians to recommend?