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Path: utzoo!linus!decvax!harpo!floyd!clyde!ihnp4!inuxc!pur-ee!uiucdcs!uiuccsb!emrath
From: emrath@uiuccsb.UUCP
Newsgroups: net.audio
Subject: Re: Cassette deck cleaners - (nf)
Message-ID: <4417@uiucdcs.UUCP>
Date: Sat, 10-Dec-83 22:28:03 EST
Article-I.D.: uiucdcs.4417
Posted: Sat Dec 10 22:28:03 1983
Date-Received: Tue, 13-Dec-83 02:26:46 EST
Lines: 21

#R:pyuxnn:-18200:uiuccsb:5700017:000:977
uiuccsb!emrath    Dec 10 21:45:00 1983

Please tell me what the good results of head demagnetizing are?
I have one of those TDK demagnetizers, and I could not detect any
difference in sound after using it. Furthermore, careful measurements
of noise levels before and after use showed no statistical difference
(less than 1dB unweighted). There is more variation from one tape
brand to the next. I did not measure distortion before and after
because I didn't have the equipment to do so.

The deck was a number of years old, with constant use, before
doing this experiment. It is an Aiwa 6900 and maybe it just never
needs demagnetization, though it is an older model ('78?) without
the new feature of an automatic built-in head demagnetizer.

I have had 4 deck models (Advent 201, Pioneer something or other,
Teac 450, and Awia 6900) since about 1973, and none of them showed
any signs of needing or benefitting from head demagnetization
(new heads, yes, on both the 201 and the 450).
Basically, I am a non-believer.