[QuadList] Capstan Size Modification

[Chill315 at aol.com]

Don
 
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.  
 
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.  
 
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.  
 
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.
 
Chris Hill
WA8IGN
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