[Machine Translation] Listening to music with components that you have created with your own hands and ingenuity. Craft" is the starting point of audio, and tube amplifiers are a field full of deep enjoyment. This magazine is a collection of ideas and techniques that invite you to the joy of "making audio", from simple crafting to full-scale amplifier production, with a focus on tube amplifiers and full of craft wisdom and hints. The book is full of theories and tricks of Mr. Yoshiro Uesugi, a master of craftsmanship, and other well-trained writers, with new contributions and reproductions of articles from "Tube & Tube Kingdom," a magazine specializing in vacuum tube amplifiers. Also included is a color reproduction of a series of articles in the monthly "Sound Boy" magazine from the early 1980s, in which Kitao Ito, the "God of Amplifiers," wrote about his profound knowledge. This is a preserved edition that explores the joys of audio construction and amplifier production.