[Bret L]

It's called "The Theory and Servicing of AM, FM, And FM Stereo
Receivers", by Clarence R. Green and Robert M. Bourque.

Despite the ungainly title there is some really good information in
here, lucidly presented. It explains biasing of both tubes and
transistors very well.

It does require basic AC and DC electricity and electronic devices
competence so is not really a primer. I recommend old ARRL Handbooks
for that or the classic Electricity 1-7 and Electronics 1-7 for that.
This book is well worth looking for on eBay.

It is also not a book of practice. and really doesn't cover the
physical aspects of working on electronics. Again, there are other
books for that.