 Airchecks, off-the-air recordings of complete shows made by, or at the behest of, individuals for their own private use, sometimes help to fill in such gaps.The contents of privately made recordings of live broadcasts from the first half of the 1930s can be of particular interest, as little live material from that period survives.Unfortunately, the sound quality of very early private recordings is often very poor, although in some cases this is largely due to the use of an incorrect playback stylus, which can also badly damage some unusual types of discs.