This pocket-sized 13th edition of the Tube Substitution Handbook is a must-have for any vintage audio and video enthusiast. Written by Howard W. Sams & Co., this reference book provides comprehensive information on tube substitution for vintage electronics. The book is a great addition to any collection and is perfect for those interested in vintage manuals, parts, and accessories. With free shipping, this book is a great value and a rare find for collectors. Don't miss out on the opportunity to own a piece of audio history.