The book provides a very good introduction to the world of Audio Amplifiers. Quite wordy.
It fails to give a good technical/mathematical explanation of why and how. Nor does it give the grounds/basis from which to design a circuit. For example, what are the right values for a Zobel Network stabilisation circuit on the output of an amp? Rule of thumbs seem to be the go here, often they are not good enough.
If you want to understand, what bias current is best in the input stage's differential long-tail pair, or how to caluclate and make the best choice emitter resistor value for the output stage devices, then this book ain't for you.