I wouldn't have learned of Nakamichi if you hadn't had this wonderful conversation with me.Yes, there is a bunch of Nakamichi aficionados out there, and their advice is probably well taken. You hit the nail on the head when you talked about parts becoming unavailable as the years go by. Also, it is not easy to find people who are skilled at fixing these old technology instruments. These issues are widespread and not just confined to audio equipment. Computers in general, software and hardware, all become obsolete, so maintenance becomes harder as the years advance.
As for technology aging, technology itself, in the form of the internet, has helped with this. For example, the only way I could keep a Volkswagen Type 3 on the road is with the online NOS parts availability. I bet the same for Nakamichi and other audio equipment. I'm okay with a fine piece of equipment requiring more work to keep it going, I would say I would even prefer it. One of the things I want to learn is how to at least re cap a radio, if not know how to do all the work, as I desire to keep these tube radios in working condition all my life and rather not be reliant on others.
How interesting, wonder how many are employed in that department. I also wonder how they decide what to save, since we know not everything can be saved.I've heard that the Library of Congress has a unit whose full-time work is to archive materials from older media to newer media -- Hollerith cards, magnetic tape, paper tape, larger and smaller floppy disks and hard disks, and of course solid state drives. They are all in various states of obsolescence, so this is a never-ending project! Well, as they say, in life, change is the only constant.