[Mike Rivers]

On Aug 7, 7:11 pm, "Arny Krueger" wrote:

The best way to adjust azimuth is to have a mono test tape, and adjust the
azimuth until tape heads tracking the top and bottom edges of the recorded
track reproduce waves with identical timing.

That's the best way to adjust it to a standard, but the cassettes to
be played may not have been recorded with the heads set to that
standard. And the real problem is with instability of the tape
relative to the head, both when recorded and again when played.

For a "better than random" setup, making one adjustment before playing
a tape is probably sufficient, but it should be done for each tape.