There are several very good Sansui’s. AU’s 717,919, 7900, 9900, 777, 888, …
I am partial to the 5900 & 7900. The 717 / 919 are very solid and the 777 / 888 are known to be warm and tubey.
Makes me wanna bring some old gear out of retirement.
20 Vintage Amps That Prove They Really Don’t Make Them Like They Used To
I found this article to be interesting and very educational! Enjoy!
https://www.headphonesty.com/