What can I say? The only Sansui I have ever heard is my AU-6500; a 10/10 perfect cosmetic 100% operational beauty that has never been worked on except me setting the DC offset & bias, and pot/switch cleaning... all still original everything. Controls are silent, runs cool, never have had an issue and has always sounded great. Sometimes I wonder if the clarity is helped by it having the minimum number of switch contact surfaces in the signal path compared to more full featured amps?
Only 28 watts but with LaScalas I'm listening deep into the first watt - strong, detailed, and musical.
I wish I had heard other Sansuis but I just haven't, only old same period Yamaha (30W) and Nikko (34W) neither of which could hold a candle to this amazing amp. Honestly, I can't imagine a much better sounding amp, which sounds funny as it is my only example of Sansui; I'm sure that other Sansui amps are superior to mine but it's just really hard to believe.