RSM Vol 06 - How To Test And Replace Resistors And Volume Controls

This 1947 training manual from the National Radio Institute serves as a technical guide for diagnosing and repairing resistors and volume controls in vintage radios. The text categorizes various hardware types—such as carbon, wire-wound, and variable resistors—while detailing common malfunctions like open circuits and noisy terminals. Practical instructions emphasize the importance of using multimeters to verify resistance values and warn technicians about the risks of shunt paths during testing. Furthermore, the source explains the R.M.A. color code system and provides criteria for selecting suitable replacement parts based on wattage and physical size. Detailed procedures for swapping out potentiometers and tone controls are also included to ensure smooth mechanical operation. Ultimately, the booklet provides a structured approach to radio servicing by combining fundamental electronics theory with hands-on shop techniques.