You'll probably be safe with the 7500, but the NAD definitely caused some distortion at higher volume. The tubes produce a liquid midrange I doubt you could duplicate with a SS amp.
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Oppo BDP-83SE
Outlaw 990
Jolida 801A (Stereo Unlimited mod)
Antique Sound Lab AV-25 (three)
Magnepan 1.6 (Stereo Unlimited mod) LR
Magnepan MC1 surrounds
Opera (mod) center
AMC subwoofer (mod)
Panasonic 65VT50