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Actually, you might want to think ahead and look at Trogotronic's power supply system. Massive current capacity, and not expensive. Since Trogotronic has a lot of tube designs in the module lines, they should know a thing or two about supplying high current loads. Plus, something of that sort should be good to go for quite some time; all you'd need to do is to keep daisy-chaining passive power modules of some variety to deal with even a very large rig.