Jimmy, I think what you are looking for is one of the books written back in the 1950’s, by guys like Harry F. Olsen. A technical book, with electronic theory and principles for aspiring audio engineers. Don’t bother with an "audiophile" book---writers of them speak in subjective language, not technical.
By the way, if you’re in the San Francisco Bay area, Roger Modjeski of Music Reference is teaching a class in amplifier design. Taking that class would be a great way to both learn audio engineering and build your own tube power amp. If I still lived in my hometown of San Jose, I’d do it myself.