Tube Substitution Handbook 18th Edition 1974 http://ping.fm/xrWqF

Vacuum Tube Substitution Handbook 18th Edition 1974 by Howard W Sams and Co Inc. The outer front cover has some bends and the top right pages of the book have a slight fold, the 96 pages of substitutions are very clear and readable. There are 7 Sections – Substitutions for: American Receiving Tubes, Picture Tubes, Sub-miniature Tubes, Industrial Tubes, Communications and Special Purpose Tubes, Foreign Substitutes for American Types, American Substitutes for Foreign Types.