Detailed guidebook on the design and construction of vacuum tube amplifiers. As shown in the photos, the cover is torn, and the back cover is missing. There is yellowing and staining. There are some markings and writing (photos 6 and 7), but it's minimal. - Title: The Enchanting Vacuum Tube Amplifier: Its History, Design, and Construction - Content: Detailed information on the design and construction of vacuum tube amplifiers - Chapters: Design examples and circuit diagrams of multiple vacuum tube amplifiers - Construction Examples: Includes over 40 construction examples Thank you for viewing. *2F