I maybe wrong but if I remember correctly, the "Sansunog" term here was coined due to high rate of failure among Sansui amps and receivers that were common at the height of "Saudi days." The early OFWs brought home a lot of Sansui amps and receivers -- models starting with "A" for amps (not AU) and "R" (instead of "G" or "Z") for receivers. Those gear were made as part of component systems and accepted only 8 to 16 ohm speakers (better if used with the prescribed Sansui floorstanding compo units). I myself experienced one such failure, a few weeks after I hooked an AR speaker rated 8 ohms to an A-707 amp. The Audiolab Timog technicians told me later that AR speaker had an effective 6-ohm impedance. Some Sansui/Sansunog owners used Infinity, very popular during those days, rated 4 ohms resulting in breakdowns.
Take note that models A for amps and R for receivers hardly appear in existing Sansui directories, especially those released in Japan. This only shows the Japs sold inferior and cheap Sansui in the international market during those years to corner a good share of the newbie market, especially those who tend to favor "looks" over "sound." The hifi oldtimers here who saw those early component packages would attest how good-looking those systems were.
On the "feedforward technology", I'm not a technician but I've read somewhere it also involves high bias and thus Sansui hardly used class A description in its upscale amps even as most of their good amps run hot. There's only one major documented complaint on oscillation specifically model AU-X1 involving a unit acquired by BeatleFred the former moderator of Sansui forum in Audio Karma and his case spread like wildfire on the Internet. The feedforward technology was generally blamed for it -- the unstable bias or biased to the edge, whatever -- but BeatleFred admitted in his later post in AK and Classic Sansui forums that the unit he complained about seemed to be already defective when sold to him. After some research, the seller of that problematic AU-X1, he concluded, had cases of disposing altered/modified units not only of Sansui's but Accuphase's as well. Take note that Beatle Fred has two AU-X1 units and that he never had a problem with the older one.
BTW, I have an AU-X11, which is almost the same as AU-X1 (except for my unit's wood side panels and a different heat-sink layout.) A friend here in Davao also owns an AU-X11. That model does run hot, like class A, but we never had a problem with it.