"How to Gain Gain" is a technical book that delves deeply into the methods of obtaining amplification and generating constant currents through triodes for audio preamplifiers. In 17 chapters, 28 common methods for achieving amplification are explained in detail. The book provides comprehensive sets of formulas for calculating gain, frequency, and phase responses for various circuits built with this type of vacuum tube. The detailed derivations of the gain formulas enable readers to utilize the necessary datasheets and specifications of the triodes to perform precise calculations. Additionally, each chapter includes example MathCad worksheets that facilitate easy tracking and application of the respective formulas. The final chapter contains extensive calculation examples for a three-stage linear preamplifier as well as a three-stage RIAA-equalized phono amplifier, demonstrating the differences between feedback and non-feedback relationships.