159 pages. Clean and Unmarked Text. Paper / Soft cover edition in very good, like new condition. Firmly readable. Flex covers, spiral bound style, a sturdy book. Overall great reprint copy, a delightful book with minimal wear. General bookshop wear, may have some slight wear to edges and spine, stored flat. Would make a great gift for the fan in your life, even if that's you. Additional Details ------------------------------ Product description: Excerpt from the Preface: High-fidelity amplifiers have long been involved in the battle of specifications. Very few amplifiers are sold today that do not have a long list of data which define its characteristics. Practically all amplifiers have been checked and reported on by various test laboratories which have either confirmed or denied the published specifications. The data presented to the consumer by the manufacturer or independent laboratory require the use of specialized instruments and careful measuring techniques. Although medium-quality instruments may be used to compare two different units with reasonable accuracy, excellent-quality instruments must be used for absolute measurements. The types of instruments required and available for measuring audio equipment are discussed in the first chapter. A comparison of different types of instruments used to perform the various tests, as well as the characteristics and requirements of a good instrument, are also discussed. The meaning o various pieces of data as well as the laboratory methods used to obtain this information is covered at length. For example - how does peak power differ from rms power, and how do the two differ from music power? Does the peak-power or music-power specification have any significance, or is either one just a bigger number than rms power used primarily for advertising purposes? Is a damping factor of 20 more desirable than a damping factor of 4? Answers to many questions are contained in this book, which is intended for the technician, engineer, or audiophile.