Not only the quality of the system itself, people forgot the documentation! I still use my father's TEAC AX-55 MkII amplifier: the service manual includes full PCB printouts, block diagrams, schematics, and component list with all the part numbers and description: http://www.vintageshifi.com/repertoire-pdf/pdf/telecharge.ph...
In the rare case something fails, you can literally keep rebuilding the damn thing just like Theseus' ship. This level of documentation is just completely alien for today's consumer electronics.
In the rare case something fails, you can literally keep rebuilding the damn thing just like Theseus' ship. This level of documentation is just completely alien for today's consumer electronics.