[QuadList] Ampex High Speed Dubber and later VHS systems

[Chill315 at aol.com]

This is an excellent post regarding the high speed duplication of  tapes.
 
I was wondering how did these units do the audio and control tracks?   Were 
these done the same way, just copy the magnetic domains or were they done  
with a separate set of heads?
 
Chris Hill
WA8IGN
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