The oldest piece in my rack is my Mark Levinson No. 28 preamp (30 years). Yes, I’ve had to have it serviced twice but I still very much like the way it sounds. It would have been my AR ES1 turntable but I sold that when I bought my Rega P8. That I had for 38 years.
Easy my OG Linn Sondek LP 12 with an Ittok LVII tonearm. It has been in one system or another for over 40 years. Edged out my B&o 4002. Tradition mandates its inclusion in one of my systems. As they say, it has heard it all.
Had those in the day with the Linn, driven by a Son of Ampzilla amp and AGI 511A preamp. The ADS L810 were great sounding for the day. Replaced with
Magneplanar 1D.
The oldest piece of gear in my rack is my Stellar Gain Cell at just about 5 years old. The oldest piece I have in my possession is a Denon analog FM-only tuner, the TU-850, that I traded a GAS Thalia preamp for for in 1980. Second oldest is a B&K ST-140 power amp I bought around 1985 or so.
My Marantz 120B tuner is 53 years old. It was worked on about 10 years ago by Bill Ammons and brought up to original spec. Actually, better than original in some respects.
I think the oldest item in my main system is my Rega RP3, which was bought in '11 or so with a TTPSU and an Exact2 and was upgraded with all the Groovetracer mods in '15 and then with the most recent Rega improved belt when that came out. Didn’t really see a lot of use until the last few years. . . getting some more play with mostly jazz records from the fifties through the seventies as my system playback has improved.
The next oldest would likely be my Decware HR-1 speakers from '14, though I have a pair from '12 in my audio/video system. I love these speakers. Hope to never have to replace them.