Inaccurate alignment of the record head of the original recording where the angle of the head gap varies from an exact vertical position relative to the tape produces a dramatic loss in high frequencies and phase distortions when played back with accurately aligned playback machines.
HOW:
Adjust playback azimuth to optimum high frequency response (trained ears are essential). An oscilloscope or a real-time spectral analysis tool may be used to adjust for optimal high frequency response and phase coherence.
SEE:
Operation manual of Studer tape recorders
John G. McKnight: Azimuth in a Magnetic Tape Recorder
Richard L. Hess: Azimuth - Hows and Whys
