[QuadList] Non-Contact Extraction of the Program from Quad Tape

[Chill315 at aol.com]

This is an interesting discussion.  I see a couple of issues.
 
One has to assume that the tape was recorded to saturation.  That way  the 
magnetic flux will be at the maximum possible.
 
Looking at the numbers that Ennes has in his VTR book, it will be  
interesting to come up with a circuit that has the right emphasis and gain  required.
 
Not knowing the magnetic flux off the tape, it would be interesting to see  
if reading it would be possible.  Was not the orsted around 600?  I do  not 
have any old data sheets for tape.  The 10 mil track width would  help.  The 
frequencies laid down will go from 4.28 to 10 MHz unless we are  talking Super 
High Band and then the max would be 12.2 MHz.  
 
Could an air film be pumped into the head tape interface to allow the  flying 
of the heads?
 
Optical will not work with the previous type of developers.  The need  to see 
a bandwidth of 12.2 MHZ in each track is going to be difficult.  The  small 
particles would probably ruin the tape if it is ever run again.
 
How can one play a tape without destroying the layers of the tape.   Not 
having played a tape for years, what is the condition of the binders in a  typical 
tape?  Is there any one type that has less problems?  Is there  one that is 
really bad?
 
Are there any special procedures that one should use.
 
Chris Hill
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