※Shipping service. Special Feature = Full of know-how from parts purchase to design/production/measurement · From Radio Boy to Famicom generation, this one book is a license complete den/Operating principle of vacuum tube/Various amplification circuits/Illustration: Wiring and chassis processing/6L6 Complete production of single amplifiers/Latest version: List of vacuum tubes, transformer kits, published 1995.8.25. Since the photograph is a sample, the actual product may be broken or there may be writing etc.