Yamaha MT50 User Manual page 32

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Appendix
MT50 User's Guide
Demagnetizing the Recording Head
As the recording tape passes over the recording head, it tends to impart a
tiny amount of magnetism to the head. The head collects this magnetism
over a period of time, slowly becoming magnetized. You need to demagne-
tize the head using a commercially-available head demagnetizer. (These are
also available at most audio and electronics shops.) Read the directions on
the demagnetizer carefully. If you do not use the demagnetizer correctly,
you could seriously damage the recording head. Also, keep recorded tapes
away from the demagnetizer when it is in use; the demagnetizer can acci-
dentally erase your tapes!
It is best to demagnetize the recording head after no more than ten hours of
recording use. If you are planning a special session, it is a good idea to clean
and demagnetize the head before the session to ensure the best sounding
results.