A feedback at http://www.diyaudio.com/forums/solid-state/97232-sansui-intergrated-amp-su-7900-a.html speaks volumes of the AU-7900, especially since it was in a shoot-out by a stereo club!
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Frankly I was quite surprised by the "kick" from the unit - at the volume setting in the pix, it had enough juice to drive the Mission 753 Freedom to a decent volume - many articles mention the 753 can be power hungry!
No recapping necessary as it still sounds great after all these years! Quality really stood out for something in the 70's.