I sold all these in the golden age from ‘73 to the coming of digital tuning. In receivers, the Eight Deluxe was the cream of the crop. In integrated amps, the AU999 and AU9500 were great. Models below were excellent too. I got my brother a 5050 he used for decades, replacing a stack of Dyna tube gear. The 7070 was the more powerful version. The higher models 8080 and 9090 were sold with Dolby NR onboard, a kind of vestigial organ. Match any of these with KLH 5 reissues or JBL L100 reissues and your brother will be happy indeed.
Sansui?
I have a brother-in-law, retired Navy, who is interested in a nostalgia system. When he served in in Pacific in the 80's they could get great deals on Sansui equipment and is of the opinion that Sansui was top of the line. He asked me what I would get but I'm clueless about 80's receivers. I doubt that he wants separates. I'd greatly appreciate hearing your opinions. My brother-in-law is partial to Sansui, but should I suggest something else? He's got good ears even though he's not an audiophile. Thanks.