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<DIV>George</DIV>
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<DIV>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.</DIV>
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<DIV>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.</DIV>
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<DIV>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. </DIV>
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<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
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