Jon I wrote...

Since my dual 2N3055 driven flyback power supply was
accidentally thrown away, I was pondering building
another until coming across subject mentioned assemblies.

Haha, 2n3055, you're talking 45 years ago!!
For the last 35 years, we use MOSFETs.

They're on eBay and elsewhere. Looks like various drivers with
flybacks. Example: https://tinyurl.com/y4lzxt85 Questions ...

Might be cheaper to buy than to build another from scratch
so your thoughts/ experiences appreciated.

It's a shame they never provide schematics or similar
information. You do get a nice set of parts, and can
reverse engineer to get the schematic, and then start
making changes.


--
Thanks,
- Win