The center transformer is for the dedicated power supply of the Joshua Tree attenuator.
And no, you don't have to rewire any of the transformers to another voltage. All transformers have dual primaries, and the fuse holder contains a switch that connects the primaries of the transformers in series (for 200V-240V operation) or in parallel (for 100V-120v operation). Simply unclip, flip over, are clip again the fuse holder into the receptacle and you are done.
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