McIntosh solid state amps with both autoformer outputs and the quad-differential topology. As good as solid state will get on Defs. Pick your price; try for monoblocks; you're golden.
Zu's can have a slightly aggressive high treble with solid state. Tubes fare better. Avoid "bright" mps or amps with an overly lean presentation. That said, I had good luck with a Rega Elicit before I switched to tubes.
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