My first high end system? Its a continuum with no real obvious beginning. My first real high end component however, the one that opened my ears more than any other, was the McCormack DNA1.
By the time it became my first system the McCormack had been replaced with an Aronov integrated. It was a close call. Sound quality wise the Aronov was only slightly better. With the right preamp, IC, PC and Cones the McCormack probably would have been better. But the Aronov was better without any of that. So there you go.
The original (in hindsight, awful) JBL L7s were replaced with Linaeum Model 10. The Audioquest Dragon with Synergistic Research Resolution Reference. And the Cal Audio CDP with a Basis/Graham/Glider. That was my first real high end system- Basis/Graham/Glider, ARC PH3SE, Aronov integrated, Linaeum Model 10, Synergistic Research, Bybee conditioner.
I don't have any pics of the first one, but this is what that first system looked like in the same room. Only in the beginning there was no rack, no amp stand, and it was a Basis turntable just sitting on the floor to the side of the Aronov. That's a TV under the blanket. That was my home theater.
https://www.theanalogdept.com/c_miller.htmThe McCormack was never really in my first system. Yet it was the one thing that really got me realizing what could be. It was that good. So maybe it was in a way a part of my first system after all. I don't know. You make the call.