We lived so long without electricity of any kind...no utilities and no solar, that I think that is why these books peaked my interest when I ran across them. I found the inner workings of vacuum tubes fascinating and just the explanations and formulas a mystery to solve in themselves. I spent a lot of time working my way through the early lessons...'repaired' some old tube radios and speakers and now the books have been sitting for 20-30 years...time flies and I don't retain information very well so most of what I learned is gone but I do remember liking the way things were laid out and taught in the manuals.
The copyright on the materials for the course itself is 1956 and the additional small Allied books say 1964 and '65.
The course begins quite basic and has information that would apply to more than just 'tv's, radio and radar'.
Illustrated with many 'foldouts'....and clear information...much of which would be useful even now.
The the hardback of tv, etc. repair (1954) and the 'wiring simplified' (copyright 1941) I found elsewhere along the way...they were not part of the course but similar time frame.
"We're all just walking each other home." -Ram Dass
"Be a lamp, or a lifeboat, or a ladder."-Rumi
Location: Ozarks zone 7 alluvial,black,deep clay/loam with few rocks, wonderful creek bottom!