Kinda funny that Dave mentions that these old electronics never really break.
In my experience, they're all so incredibly shitty, none of them ever work properly. Quality control and consistent manufacturing were NOT something they did back then. Unseated chips (due to thermal cycling often), tin whiskers, dried out caps, leaking batteries, cracked PCBs (yes, lots of phenolic and paperboard back then), mold and rust damage, cracked brominated PVC, failing carbon contacts... it's all there. And even though the electronics are relatively straightforward and nonintegrated by today's standards, both hardware and software designers often had the most convoluted workarounds and shortcuts to make stuff work, meaning it's still a bitch to reverse engineer if something broke. That includes using unmarked hand-picked transistors with a specific gain to get certain oscillator margins, etc. Not saying it's all like that, but I've seen plenty of bumfuckery in 80s gear. Won't even start about Sinclair...
IMO the real golden age for consumer electronics as far as longevity goes, was the early 2000s HP/Dell high-end laptops. Up to 2 years ago I still had an awesome Dell Latitude with 4:3 1600x1200 screen from 2001. Internally, it was impeccable. No mods, all connections were strain relieved, the battery was in its own plastic shell so it wouldn't damage boards when it leaked (and it did - had to replace it), hinges were PTFE/hardened steel based so they will probably last until the end of humanity, even the fan motor had a single-shielded ball bearing. I mean, you would pay the equivalent of $8000 in today's money back then, so that will definitely have had a lot to do with it, but still. No contest.