RSM Vol 10 - How To Test And Repair Loudspeakers

This 1947 educational manual from the National Radio Institute provides a comprehensive guide for servicing and repairing essential radio components like coils, chokes, and transformers. The text explains how to distinguish between air-core and iron-core varieties while detailing common electrical failures such as open circuits, shorts, and inductance changes. Technicians are taught to use tools like voltmeters and ohmmeters to diagnose these malfunctions and determine when a part can be repaired by hand or must be replaced entirely. Furthermore, the source offers practical advice on sourcing replacement parts from manufacturers and techniques for mechanical installation, such as drilling new mounting holes or removing rivets. By focusing on identifying defects through physical symptoms and electrical tests, the guide aims to equip students with the skills necessary for professional radio maintenance.