Valve Amplifiers, Fourth Edition
".the book is a companion to the book Valve Amplifiers, 4th edition also by Morgan Jones and published by Newnes/Elsevier.  This is a serious design book with details on audio circuit design, equations and related topics.  A 4th edition means that the book has been around for a while and is being updated and there is a real market for it."--ElectronicDesign.com,March 17, 2014