Early 70's, when I heard pop's double KLH-9 setup with ARC electronics.
Late 70's, my double Large Advent setup with Advent 300 pre and GAS Ampzilla.
Mid 80's, my Acoustat 1+1s, RHLabs sub, monoblock Hafler DH220s and ARC SP3a
Late 90's, pop's B&W Matrix 800s with Jadis MC80 pre, Defy7 amp, VPI TNT with SMEV and Audio Quest cartridge.
2020, upgrading my system with and ARC SP11 mk2, VS110 and Marrow cables.