However, if the heads are mounted at slightly different angles (such as ±7 degrees in VHS), destructive interference will occur at high frequencies when reading data recorded in the cross-talking channel but not in the channel that is intended to be read.
At low frequencies relative to the maximum allowed by the head gap, however, this technique is ineffective.
Every videotape system was designed to put as much video as possible onto a given-sized tape, but information from one recording track (pass of the video head) must not interfere with information on adjacent stripes.
[1][2][3] All the early low-end reel-to-reel VTR machines and the first VCR cassette formats, the Philips and the Sony U-matic, used this system.
Later, the JVC VHS and the Sony Betamax used slant azimuth recording also.