I have a large collection of electronics magazines, including all of those RE issues shown from 1971 onward. I also have Popular Electronics when they were half-sized pubilcations. Some of those go back into the '60s. It's a real hoot to see "pictorial" assembly diagrams along with the schematic. Never an ad about a 'puter or even a calculator in those old issues. There were more ads on electronics correspondence courses.
I never understood this stereotype of week nerdy people, I wore a bunch of shirts like that while I was on the football team and going to the gym a lot.
22V batteries (actually, 22.5V) are the same size as 9V PP3 batteries, but they have one terminal on each end. You can still buy them (NEDA 215 or Eveready 412). I built a regenerative 1 tube (1S5) radio in 1958 or '59. It used a 22.5V battery for the plate supply, and a 1.5V D cell for the heater power. That little battery seemed to last forever.