I think it can be done. I did a 120 to 230V conversion on a X250. It was a fairly easy procedure. Call Pass Labs and ask for direction or send it in.
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Easy conversion for a 'qualified ' tech.
My X-250 was converted to 240V.
a couple of wires from the transformer are re-soldered
to different positions on a board - which is marked for
the different voltages.
I think the amp/s would then need re calibrated/biased so you need someone competent with these amps.