When I started in college, the oscilloscopes in the labs were all tube-type, the labs were full of analog computers, and there was a punch card IBM mainframe with line printer that ran FORTRAN.
I recall looking at the analog computer, and asking "What is it ? and how does it work ?".
I was shocked to find out that basically any system can be modeled/simulated using resistors, capacitors, and inductors.
I thought there must be more components required, but three is all there is.
Photo from the link below.
The analog computers we used actually had a large number of dials on them, for adjusting the values of the components, but we did have the spaghetti wiring.
Electronics of 1976 were not that sophisticated, but that was changing fast, and I sidestepped electronics design and went into medium voltage power distribution design.
Luckily medium voltage power distribution is somewhat of a static discipline, and the 3-phase systems have not changed much at all from the time it was popularized by Westinghouse in the early 1900's.
Power breakers are now chocked full of electronic relays, and one has to be very familiar with how they work, and to some extent how they are programmed and applied.
I miss the days when you could open the back of a TV set (carefully avoiding the often fatal large capacitor), and look at a handful of tubes which ran the entire TV.
Diddo for pinball machines.
Banks and banks of solenoid-operated mechanical contacts, and no electronics at all.
I really miss the pre-electronics era, where things were simple, and almost anyone could learn to build and/or repair anything.
Electronic kits were abundant from Radio Shack, and who did not have their own crystal radio?
View attachment 147505