Distortion fluctuation phenomena in audio magnetic heads

Fluctuations exist in the harmonic distortion of audio magnetic heads, presumably due to the "magnetizing curve disaccommodation" of the head core material. The fluctuations are most pronounced when the signal field intensity is suddenly varied. This behavior was experimentally investigated by using simple distortion measuring methods. The fluctuation is observed in both record and playback heads. Although the measuring methods may not indicate absolute distortion, the differences among various kinds of head core material are clearly shown.