This 1947 educational manual from the National Radio Institute provides a comprehensive guide to the alignment and calibration of vintage radio receivers. The text explains that alignment is the essential process of adjusting internal components to ensure a device operates with maximum sensitivity and reaches the correct stations on its dial. To perform these repairs, technicians utilize specialized tools such as signal generators and output indicators to measure performance. The manual outlines specific procedures for servicing different architectures, including T.R.F. sets, neutrodyne receivers, and more complex superheterodyne systems. By following these technical steps, a servicer can correct issues caused by aging parts or improper previous adjustments to restore optimal audio quality.
