Most enduring audio purchase

Equipment owned for 29 years -
Marantz 7 tube preamp
Eminent Technology ET2 tonearm
MIT750 Shotgun speaker cable

Equipment owned for 25 years -
Final Audio Labs VTT1 turntable
Dynavector 501
Dynavector Karat Nova 13D

Final Audio Labs VTT1 turntable blows away my Platine Verdier and everything else I've tried. Will never be sold.
Marantz 7 (modded) has blown away my Jadis & Klyne System 7 preamps and will never be sold ( I own 2 of them ).

Other vintage equipment staying in the house :
Tannoy GRF Professional speakers
Tannoy Belvedere Senior speakers

Thiel CS6 speakers. For the past ten years, these have been with me and I have absolutely no inclination to make a change or upgrade.

Speakers...Dynaudio's, Ive had them over 12 years and I love them.

.
Audio Research Reference 3...it was a game changer for me.

Infinity Kappa 9 ... amp-killing power hogs hold their own
on the high end arena if bi-amped with good power.
.

VPI HW 19 MK3 with SME 309 tonearm,working fine since 1995.