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SWR Studio 220 rewire voltage

I have just got a ST220! I need to rewire the voltage on this amp from 110 to 230 - apparently you can do this. Does anybody have the schematic or whatever instructions my tech will need?

I did email SWR but they were not directly much help with the info.

I remember always wanting one of these and I got the chance to get one so I jumped on it. Love the Baby Blue but always missed the overall bass/treble shelving controls. The EQ on this thing looks the business.

But I need to run it at 230v first. Anyone know exactly how this is done?