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You can use the existing front panel variable resistor (pot) with the SX460. It should be a 750 Ohm pot. To set it just put the front panel variable resistor in the middle of its travel and use the volts adjustment on the SX460 to set the output to 120V or 240V or whatever your target output...

I, personally, prefer the SX460. It has low frequency cutout and is a more modern design. You can put new diodes in a VR but you still have other old components in there. On the other hand the old stuff was well made and robust.