I think I still have all the standalone amps I have bought in my life going right back to an old Kenwood KA3020 driving a set of Heybrook HB100s that I bought in the 90 - 91 ish. That gets occasional use. Have a later version of the same amp (KA3020 "Discrete") hooked up to SWMBO's computer in the kitchen driving a pair of Mission 731 speakers. A second hand Arcam Alpha 7R+ that I bought about 14 years ago drives a pair of TDL RTL3s on my main audio and surround sound setup[1], and a 6 year old Cambridge Audio Topaz AM5 driving some Diamond 220 speakers for the garden listening room or ready to be deployed on the patio for a BBQ etc.
All still going strong with a bit of TLC here and there. Not had to recap any amps yet. Did have to use some pot and switch cleaner on the oldest Kenwood though, as they were getting scratchy, and the surrounds on those old HB100s are getting a bit stiffer - they need about 40 mins playing before they begin to regain their open dynamics. The RTL3s I got free from Mr Watts formerly of this group - somewhat knackered (blown tweeter, missing crossover on one side) - but after I built new crossovers, replaced the tweeters, and some of the main drivers, they sound astoundingly good.