[QuadList] Capstan Size Modification

[Chill315 at aol.com]

George
 
That makes more sense.  I found a spec for the capstan and it is made  to a 
.0001 tolerance.  This was done to prevent the wow and flutter that  could 
occur.  Still the servo had to have the bandwidth to play outside  tapes.
 
Yes the AVR 2 was a DC capstan.  It allowed more control.   One of the 
problems with the early heads and capstans was that there were errors  during 
rotation.  These could be handled but with the change from a 3 phase  head, 
more tach pulses, and the DC capstan, these errors were  reduced.  I think 
they were called something around errors,  Does  anyone know the term.
 
It was interesting that we could take an hour long tape and find that there 
 was a difference in the speed between the machines.  It was only about a  
second or two.  It was one of those late night what is the real speed  
questions as we got two different capstan error voltages after an alignment when  
playing back the same tape.  The speed error was miniscule but well  with 
in the specs.  Did a record on one machine then a record on the other  with 
the same leader wrap.  It was not that much different and I wish I  could 
remember the difference.  We used time code to determine the record  length.  
 
Chris Hill
WA8IGN
 
 
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