[QuadList] VR-1200B's on eBay

[Chill315 at aol.com]

I could not find the units on e-bay.  Perhaps someone can post a  link.
 
There were after market DG and Auto Chroma modules.  The Manufacture  slips 
the rusted open Iron Trap that is my brain.  They could not use the  term 
Auto Chroma as that is a copyrighted term.  Also this one did have an  
advantage in that it did the auto equalization on a line by line sample where as  
the Ampex one that was standard did it on a 16 line sample that was for the  
whole head pass.  This would cause a problem with different amounts of  
chroma if the head was not concentric.  RCA was the first to do it the  correct 
way in the CAVEC module.  It was easier to do it because they used  the 
addressing for the memories in both chroma and velocity error  correction.  
Ampex did not have the units combined and as a result they did  the auto chroma 
on a band by band sample.
 
Chris Hill
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