Quad Preamp 220 vs 240 volt

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Marshall_SLX

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So i have 2 quad preamps...one says wired for 220v the other says wired for 240v... they have the same mains transformer in each unit however the 240v has a bit of extra circuitry which looks to be a part of the footswitching circuit... its definitely factory as ive seen it in other pics... anyway does anyone know what needs to happen to make my 220v a 240v... it must be possible given they have the same mains transformer.

220v


240v
 
Is the PT wired up identically as well? I know some export Mesa PTs have one tap for each voltage.
 

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