Why would
anybody replace a device containing 4 simple components
(transformer, fuse, and 2 diodes) with something containg many more
components (the PC PSU)???
Although it may offend you in principle, "obsolete" PCs show up in the
gutter around here, but TRS80 parts cost money.
You mean there really are classic computer people who don't have boxes of
assorted fuses, diodes, etc? Amazing...
-tony