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<DIV>Don</DIV>
<DIV> </DIV>
<DIV>I agree with you. The modification to the capstan system will distort
the SMPTE RP for track spacing. I just see too many cans of worms.
As you point out, there is no real difference between speed. It is locked
to the head so that the speed has the correct relationship. </DIV>
<DIV> </DIV>
<DIV>As a side note, I once had a feed from a source that the 3.58 was off a
mile. It was a small facility and they could not understand what the
problem was. The tape machines handled it with ease. It was only
because the scopes were moving so fast in external that I noticed it. They
were off over 200 hertz. Yet the servo windows and correction systems were
able to correct it. We ran the feed through a frame sync first until
they fixed it and the framestore had a harder time. </DIV>
<DIV> </DIV>
<DIV>I would bet that the modification to the pulley was for something else that
was an issue such as eating belts. Most of the machines were VR-2000 so
they may have had an earlier design in the capstan assembly. According to
the parts list for the end of the run, the capstan was a -30 version. Also
the flywheel was a -10 version. So there were probably modifications to
the capstan as the production was done. </DIV>
<DIV> </DIV>
<DIV>Note my VR-1200 books are from 1973. Near the end of the run.
The Inter sync book talks about having to replace capstans on earlier
machines. I do not know the why this was required.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV></FONT></BODY></HTML>