In 1975, my best friend had a Sansui 1000a 50 wpc tube receiver. My other friend Sansui "super receiver" 9090DB with 125wpc solid state.
We didn't know why, but all of us knew that the tubed receiver sounded better.
Years later, here we are selling tons of tubes amps at Upscale Audio.
But since I have reached the ripe old age of 54, I have gon backwarded to my you. I have a couple mint 9090DB (which sound like ass) and maybe seven 1000A which I have had restored at great expense, along with some vintage JBL Jubals.
Get a 1000A. It will need to be re-capped, but the payback is huge. I sold the AU-919 new when I worked at Cal Stereo, and they are fine, but there is no emotional hook.