Sams Transistor Substitution Handbook from 1963 is a vintage reference used by radio and TV service technicians to find replacement transistors. It lists thousands of early transistor types from American, European and Japanese manufacturers together with suggested substitutes and the base diagrams showing the pin arrangement of emitter, base and collector for each case style. The book was intended to help repair transistor radios, amplifiers and other equipment when the original part was not available. Today it is valuable for restorers of vintage electronics, collectors and anyone trying to identify old transistor types and their pinouts or find a modern equivalent.