 Most of the Golden Age programs in circulation among collectors—whether on analog tape, CD, or in the form of MP3s—originated from analog 16-inch transcription disc, although Some are off-the-air AM recordings.But in many cases, the circulating recordings are corrupted (decreased in quality), because lossless digital recording for the home market did not come until the very end of the twentieth century.Collectors made and shared recordings on analog magnetic tapes, the only practical, relatively inexpensive medium, first on reels, then cassettes.