Hi. The longest and still in use running the PC audio and a turntable right now just above the monitor is a Marantz 1060 Console amp. I bought it in 1969. So 57 years.
Wow! It is lovely that the Marantz 1060 has been with you for 57 years. That's quite a long time, and it shows that the gear is good. My Boss Katana 100 has been nice, too, and that's what I've been using for a while now.
How does Marantz sound with your turntable and PC after all that time? Do you have any tips on keeping old amps being active for this long?