On Mar 14, 2020, at 10:26 AM, Thomas DeBellis
<tommytimesharing at gmail.com> wrote:
I think that's an easy case to make for hardware; sooner or later you run out of
vacuum tubes...
Not as soon as you might think. They are still made. And they can be made at home, with
practice. Transistors are harder, and with VLSI you're dependent on the manufacturers
to keep manufacturing.
I remember some years ago a company that specialized in making and selling obsolete
germanium transistors.
paul