tpchmara@wateng.UUCP (Tom Chmara) (10/30/84)
[ Reality is for those who can't afford high-end audio equipment ]
I'm looking for a demagnetizer which can be used in my automobile
cassette deck (one of those side-loaders: can't get a wand in there for love
nor money), and wouldn't mind using it in my home machine if it's effective
(I presently use a TEAC E-3 demagnetizer, and will continue doing so at home
if the cassette-style is less than wonderful).
I've been looking at the D'MAG by discwasher, the only cassette-shell
demagnetizer which claims to demagnetize the capstan and other parts of the
tape path (the standard electronic toys only do the record/playback head(s)).
It's (from what I've been able to see of it) a magnet/pair of magnets connected
mechanically to the hubs such that they spin when you ff/rw. Well, you do first
one (ff) then the other (rw), each for 5 sec. and your deck is demagnetized.
I'm presently chewing on a large grain of salt. A number of questions
come to mind: how do these (permanent) magnets avoid establishing a residual
field between the time they stop spinning and the time you haul them out of the
deck? The field is not a decaying AC magnetic field, but rather a constant
one: is this very important? Also, if the magnets are insufficently strong
to make this a concern, are they strong enough to demagnetize the heads of
the tape deck?
ARRRRGGGGHHHHH. (Just had to get that out)
....thanks for any help you can give me in this regard
---tpc---
(Tom Chmara EE @ University of Waterloo)
--
...!{allegra | decvax | clyde | ihnp4 }!watmath!wateng!tpchmara