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<DIV><FONT size=3>The Intersync servo was certainly well known for not being the
most stable device. However, for 1200's or 2000's still in operation,
there are improvements that make a huge difference. As David pointed out,
there were revisions made thru the years, obviously in part as a result of user
input, and also due to improvements in components and designs. Some of the
later Intersync systems are much more stable than their earlier
cousins.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>To further improve the stability, the use of a precision power
supply for the servo system not only improves the servo performance, but also
can make a small improvement in the signal system. The standard Ampex 1200
had a common +/-12vdc supply for the signal system and the servo. It was a
simple design that did not provide the best regulation or stability. By
providing a separate, highly regulated and stable supply for the servo, the
stability of the servo improved and the s/n of the signal system was slightly
improved by removing the servo load from the common supply. Merlin offered
such a mod, or it can be done fairly easily today using modern
supplies.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>There are also some components within Intersync that can be
replaced with newer parts that are much more stable than the 40 year old
originals. On a machine where these mods have been done, it is rarely
necessary to do the daily setup, even when the machines are cycled on
and off or experience other temperature shifts. I can apply power,
load a tape, push play and expect full lock in 4 sec without any
adjustments.</FONT></DIV>
<DIV> </DIV>
<DIV>Obviously, at the time that most of the quads were in service, they didn't
have the benefit of these improvements. I don't know how many of the
Merlin kits were installed or how others may have addressed the servo problem,
but obviously the ritual of bowing to the Intersync was a well know exercise of
the day!</DIV>
<DIV> </DIV>
<DIV>Don</DIV></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=dcfwtx@aol.com href="mailto:dcfwtx@aol.com">dcfwtx@aol.com</A> </DIV>
<DIV><BR></DIV>
<DIV>In the mid 60's, CBS and NBC had individual modifications to the VR 2000
that they frequently shared. CBS was notorious for modifying just about
everything when it came into the door. Many of these mods were incorporated
in<FONT face="Arial, Helvetica, sans-serif">to</FONT> later production models,
such as the VR 2000<FONT
face="Arial, Helvetica, sans-serif">B</FONT>s.<BR><FONT
face="Arial, Helvetica, sans-serif"><BR>David Crosthwait<BR><A
href="http://www.dcvideo.com">www.dcvideo.com</A><BR></FONT></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>-----Original Message-----<BR>From: Guy Spiller <BR><BR>
<DIV id=AOLMsgPart_0_f4a6046c-99ed-48c8-add5-ee5cd660e0f5
style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: rgb(0,0,0); FONT-FAMILY: Tahoma,Verdana,Arial,Sans-Serif; BACKGROUND-COLOR: rgb(255,255,255)">Wow,
does this bring back memories...even though I was 19 at the time. <BR>I
think my knees are starting to hurt again after seeing this!
LOL <BR>Guy <BR> <BR><A
href="mailto:Chill315@aol.com">Chill315@aol.com</A> wrote: <BR>> We
had this on a 5 by 7 card that was taped inside the door below the >
monitor on the sidecar. It worked and we had very few problems. > Thought
that I would pass it on. <BR>> > Chris Hill <BR>> > >
> VR-1200 B Series Inter-Sync Systems Daily Set Up <BR>> > PRIOR
TO ANY ADJUSTMENT, LET HEAD SPIN FOR ABOUT 30 MINUTES <BR>> > Do in
the following order <BR>> > Reference Discriminator <BR>>
With head spinning, adjust R28 on board 2 for zero. <BR>> > Drum
Oscillator <BR>> > With head stopped, adjust Drum oscillator R21 on
board 6 for stable > wave form. <BR>> > Tach
Discriminator <BR>> > With Drum spinning, set R85 on board 6 for
zero <BR>> > Capstan Oscillator <BR>> > Set Capstan
Oscillator for steady wave form <BR>> > Capstan
Discriminator <BR>> > With Machine in Record, set R1 on board 12
for zero <BR>> > Drum Tach position <BR>> > With Machine
in Record, verify that tach is at correct position on > demod using pulse
cross. <BR>> > <BR>> If doing editing, <BR>> >
Turn Editor on <BR>> > Set H Phase to zero with input that you are
using when source is timed <BR>> > Set Tach Phase to same position
as was used in RECORD mode <BR>> > Note: If original tape was as
recorded with incorrect Tach phase, set > Tach phase to match the incorrect
tape. > > H phase sets quality of in-going edit and Tach Phase sets
quality of > out going edit. Do a test edit if desired and check AMTEC
error for > quality of edits. <BR>> <BR>>
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