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<DIV><FONT size=3>Hi Chris:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Merlin did do some conversions of VR-1100's, but they also did
conversions of 1200's which is what Park has. Merlin did this for years,
starting with the TBC-800 from Ampex, and progressing thru other models as the
technology improved so that when you get to the version that Park has, the TBC
design is relatively "modern", ie 10-bit. My impression (which may not be
accurate!) is that most of their work went into 1200's. Perhaps Ken can
addess this for us.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Don</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Chill315@aol.com href="mailto:Chill315@aol.com">Chill315@aol.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=quadlist@quadvideotapegroup.com
href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 08, 2009 9:52
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] TBC</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000 size=2>
<DIV>The RCA machine did use the servo to keep the video in the center of the
TBC window. Ampex did it a different way. Thus I always found the
Ampex method easier to keep running. The feed back loops in the RCA had
you scratching your head every now and then.</DIV>
<DIV> </DIV>
<DIV>The reason that I would put the TBC after the AMTEC is that it does a
flywheel type of correction when the machine is not H locked. This
is the first step in the correction process. To go later would be a
potential issue. The Colortec would be shut down in this mode. The
Proc Amp would replace the sync. Thus this is then the only spot that is
easy to grab with any certainty of working. </DIV>
<DIV> </DIV>
<DIV>The Merlin machine was based upon the upgrading of a VR-1100. This
originally came with a simple servo that could only do Vertical lock.
Thus the need for a one line window TBC. Thus you could High Band the
machine and not have to get an Intersync or Colortec. </DIV>
<DIV> </DIV>
<DIV>The playback in the side by side shows the quality of both. If this
is the original, you can see the difference. The aliasing will tell you
which is the Merlin machine. The lack of a good drop out compensator
will tell you which is the Ampex original. The Ampex machine used the
built in one that was included with the AFC modules.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV></FONT>
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