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<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></BODY></HTML>