Crowhurst and Cooper wrote many high fidelity design articles for Radio-Electronics in the early 1950-ies. Gernsback had the original authors edit, rewrite and assemble them into this book.
The aim was to provide design information for the enthusiast without much formal education, as well for those with advanced understanding of the subjects, but needing some help to visualize problems in tube-based Hi-Fi design.
Sixty years later, we have better methods and means to design audio, but basic facts, figures and ideas still stand, and the book gives interesting insights and backgrounds how things were done and why we are where we are today.
Part 1: Feedback: Feedback effects, Analysis and design, Response and stability, Distortion, Extending design factors;
Part 2: Design and Testing Techniques: Drivers and inverters, Power supplies, Attenuators, Filters and equalizers, Scope test procedures, Speaker systems, Advanced techniques, High-power amplifiers, Test equipment design, Improving old amplifiers.