Personally I wouldn´t, unless actually needed; others may differ.
As of creeping up voltages, they rise but not dangerously so, still within tolerance, and there´s not a practical way to adjust that, unless power transformer is an "Export" type with 220/230/240V taps .
Some are wound that way, but I guess Peavey is happy with "universal" 2 x 120V>1 x 240V windings.
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