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<DIV>Hi Mike:</DIV>
<DIV> </DIV>
<DIV>The 900 series definitely outperforms the 800 and lower series machines,
and includes backwards compatibility for the constant-torque tension system of
the smaller machines. However, all IVC machines had carrier frequencies of
5.4 - 6.6 MHz including the 900 series, at least up through machines made in
1972. Actually, the carrier isn't generally listed on any of the
spec sheets I've seen, but you can find it in the service manuals. I can't
find any info that indicates a change to the frequencies, but perhaps someone
has more documentation than I do. </DIV>
<DIV> </DIV>
<DIV>Don Norwood<BR>Digitrak Communications, Inc.<BR><A
href="http://www.digitrakcom.com">www.digitrakcom.com</A></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mike@bolandcom.com
href="mailto:mike@bolandcom.com">mike@bolandcom.com</A> </DIV>
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<P>The IVC 900 (& 960 editing machine) were highband (7.06-10 MHz)
tension-servoed</P>
<P>machines that would accomodate large reels for 1.5 hour programs.Â
Used with the </P>
<P>DOC and "wide" window (40 µs?) 4102 analog TBC, the machine gave better
playback<BR></P>
<P>performance than many contemporary quad recordings. (Many, maybe
most, quads </P>
<P>at the time did not have Velcomp or Autochroma to fix guide-position errors
caused </P>
<P>during recording.)</P>
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