[QuadList] 1970 3M Industrial Tape Sales Sheet coming soon

[Don Norwood]

Hi Mike:

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.  

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com
  ----- Original Message ----- 
  From: mike at bolandcom.com 


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  The IVC 900 (& 960 editing machine) were highband (7.06-10 MHz) tension-servoed

  machines that would accomodate large reels for 1.5 hour programs.  Used with the 

  DOC and "wide" window (40 µs?) 4102 analog TBC, the machine gave better playback


  performance than many contemporary quad recordings.  (Many, maybe most, quads 

  at the time did not have Velcomp or Autochroma to fix guide-position errors caused 

  during recording.)



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