Marantz 1060 Integrated Amp, Philips GA-212/B&O SP-12 and Large Advents. My college system. Had to have a TT with auto-stop. Put lots of miles on that system. Would own any of those pieces again.
Marantz 3250170DC/2110 Stack. Gorgeous to look at and to listen to. Plus the tuner had an oscilloscope! Should never have sold it.
JVC QL-7 Turntable. Better than any equivalent Technics, then or now. Should never have sold it.
My Apt Holman Preamp. Bought in 1981, rebuilt/upgraded in 2021. Will never sell it.
McIntosh MC-240 Amp. Customer trade-in for $100 credit on an Onkyo receiver. Retubed it kept it 20 years sold it for $1200 to buy my first home theater. Miss it.
Adcom 5400 (Nelson Pass design 100W/ch MOSFET) When all else fails, my 5400 comes to the rescue. Currently driving my in-wall subs in my theater. Might reunite it with my Apt for dedicated vinyl system.
VPI Super Prime Scout /JMW Memorial 10.5" Printed Arm/Hana SH. My retirement present to myself. A thing of beauty to look at and listen to, and nowhere near as cantankerous as VPI detractors would have you believe. Keeper.
Monitor Audio Silver 300 7G. Absurdly good speakers for the money. British refinement plus the dynamics of a JBL, all in a package that's intended to be placed closer to the rear walls than most, which is what my living room requires.
There are lots of other pieces I've owned enjoyed, and sold or traded for various reasons, but these are the ones that that remain my 'greatest high end audio purchase(s)'