HB> JH> The bias applied to a tape head is an ultrasonic signal fed along
   >   > with the music information to keep the oxide magnetization within
   >   > the linear portion of its hysteresis curve.  The various tape types
   >
   > The metal tapes I recently purchased read on the label:
   > "PURE METAL   OXIDE FREE"
   >
   > What does that mean?  No oxide magnetization?
There will still be a bias applied to the head.  All magnetic tape
formulations are subject to the effects of hysteresis.
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