It is no secret that the lamp instrumentation of sound amplification in the last 10 years is experiencing a rebirth, and photos of lamp structures were “recorded” on the covers of popular audio magazines, the release of radio lamps mastered (or resumed?) by leading companies in the United States, Europe and Japan. Unfortunately, information about radio lamps is scattered over outdated directories issued before the 80s of the last century, which are bibliographic rarity, as well as on Internet sites that are often not optimized for search engines. There is also a lack of information on the sound use of lamps not originally intended for these purposes (modulatory, generator, television) The purpose of the book is to gather information about the most popular radio lamps designed (or applicable) for use in sound reinforcement, to acquaint the reader with modern lamp circuitry. Not only data on cap, electrical parameters, volt-amp characteristics (VAC) of radio lamps are given, but also recommendations for their use, including various schemes for building lamp cascades and sound reinforcement equipment. The author deliberately avoids subjective assessments of the quality of sound, pseudo-scientific, frankly commercial and even mystical terms ("virtual depth", "tonal balance", "airiness" it. p. ). The reasons why one amplifier provides a better sound than the other (having similar objective parameters) should be sought with the help of a spectroanalyst, rather than magical passes and spells. Attention!In lamp constructions, life-threatening voltages are used. When dealing with the diagrams given in this book, be extremely careful and cautious. Beginner radio amateurs should check and first turn on the assembled structure under the guidance of experienced specialists. Remember that the danger is even a device disconnected from the electrical network - the capacitors of the power supply can retain charge for several days. Take care of yourself and your loved ones.