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<p>On 2/9/20 8:48 PM, Corey Bailey Audio Engineering via ProAudio
wrote:<br>
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<blockquote type="cite"
cite="mid:ce918140-63b6-91f6-bff4-7396b6c27318@baileyzone.net"><font
face="Arial">While I understand that you are capturing both
signals during playback (on yet, a different machine), aren't
you assuming that the record head & the erase head were in
perfect agreement on the original record deck?</font></blockquote>
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<p><font face="Arial">The signal that remains on the tape is the
bias signal from the record head, same head that's recording the
audio. Thus, the bias and the audio on the tape have exactly
the same azimuth and the same wow and flutter. <br>
</font></p>
<p>I don't know whether the erase head records a signal on the tape
at the erase frequency -- I've never tried running a recorder with
the record head disconnected. If the erase head does record the
erase frequency, the bias is certainly strong enough to erase that
signal. <br>
</p>
<p>Playback is done with a head that's got wide enough bandwidth to
capture both audio and bias with the same head. Because both
signals are recovered by the same gap, flutter caused by the
playback machine will be identical for audio and bias. Plangent
processing will remove both the flutter of the recorder and the
flutter of the playback machine.</p>
<p>-- John Chester</p>
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