On Jan 21, 4:42*am, "William Sommerwerck"
wrote:
Wouldn't lining up against a fixed head 'MP3 cassette adaptor' be
pretty spot on, a good quality one without a wobbly slanting head?

In a word... NO. An even better word is one you hear on "Antiques Road
Show" -- provenance.

When you do a playback head and equalization alignment you are setting
a standard for comparing your record head, (in a three head machine)
and it's associated electronics. If there is any guess work involved
in the playback alignment procedure then there can be no confidence in
anything else that you do. Lenny