05-24-2020, 10:02 PM
A couple of old chestnuts that haven't been mentioned are "Elements of Radio Servicing", by Marcus; "Radio and Television Circuitry and Operation", and it's companion volume "Radio and Television Servicing and Repair" by Ghirardi. Another one by him, very dated but thorough, is "Radio Physics Course". The old NRI course books are also very good; I studied them 55+ years ago.
Tim KA3JRT