Archive of the former Yahoo!Groups mailing list: Mellotronists

OK - before I replace these worn out tapes, how do I know if I did a
thorough job demagnetizing the tape heads? I know there's
magnetometers (gaussmeters) out there, but in fact, has anyone
measured the magnetic field strength of a tape head when it's
magnetized and/or after being demagged?

(Just being paranoid - don't want to wipe the high end out testing my
work).