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<DIV>I saw the front extrusion and knew that it was the same as the VR-7800 and
VR-7900 plus the AVR-2. This style was also used by the audio
people. </DIV>
<DIV> </DIV>
<DIV>I was under the impression that it was a quad so that is why I went to the
AVR. I wonder how they were able to keep the cost down using the AVR-1 TBC
design rather than another type. This would be a question for Bill
Carpenter. </DIV>
<DIV> </DIV>
<DIV>I always was under the impression that the AVR-1 buffer was way too costly
to manufacture. That is why the ACR-25 went to the B model that had a
digital TBC. </DIV>
<DIV> </DIV>
<DIV>I await for the comments.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/13/2011 11:08:26 P.M. Eastern Daylight Time,
dwnorwood@embarqmail.com writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV><FONT size=3>And once again, Chris is the winner!!!!</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Bill Carpenter told us about a mini buffer (TBC) that
was designed for the VR-1400, a VR-1200 fitted with the new TBC to
replace Amtec/Colortec/Velcomp/ProcAmp, but the machine never became
a product due to the development of the AVR-2. However, the TBC design
went on to become the TBC-790, intended for use with the
VPR-7900.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Ampex used some of the modules from the AVR-1 as well as
some newly designed modules, but the card cage design of the TBC-790 was
different in several respects from the AVR-1. For one thing, there were
coax connectors in the AVR-1 back plane, but not in the TBC-790, so the
coaxial connections that would normally have mated with connectors on the rear
of the modules were instead routed to connectors on the front panel. I
suspect that was done to save cost, however, another difference has always
puzzled me. For whatever reason, the card frame in the TBC-790 is
"upside down and backwards" as compared to the AVR-1, so the re-purposed cards
(which were not re-labeled) have connector pin numbers that are opposite of
what you would expect. </FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Otherwise, the mechanical design of the modules is unchanged
except for the extruded aluminum handle that runs the length of the module
instead of the "loop" handle on the AVR-1. It's the same design as used
on the AVR-2, VPR-7900 and VPR-7800. Here's a pic of the module
installed in a TBC-790 with jumpers between modules taking the place of the
back-plane connectors in the AVR-1.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><IMG SRC="cid:X.MA1.1305342941@aol.com" border=0 hspace=0 alt="" align=baseline DATASIZE="49882" ID="MA1.1305342941" ></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Interestingly, in the TBC-790 manual, for the modules that
were "borrowed" from the AVR-1, there was no re-working of the drawings to
match the new configurations for the TBC. The pages from the AVR-1
manual were simply copied, ignoring the changes in the mechanical design and
the pin numbering!</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Don Norwood<BR>Digitrak Communications, Inc.<BR><A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/">www.digitrakcom.com</A></FONT></DIV>
<BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mailto:Chill315@aol.com href="mailto:Chill315@aol.com">Chill315@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 13, 2011 10:37
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] What is
it????</DIV>
<DIV><BR></DIV><FONT color=#000000 size=2 face=Arial>
<DIV>Then there is only one answer. It is for the TBC that was
designed for the VR-7900 type A machine. </DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/13/2011 10:25:51 P.M. Eastern Daylight Time, <A title=mailto:dwnorwood@embarqmail.com href="mailto:dwnorwood@embarqmail.com">dwnorwood@embarqmail.com</A>
writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV><FONT size=3>Hi Chris:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>No, I didn't say it was for a quad, just that it was
"firmly rooted in quad history". You got part of that answer
right! And Park got the 1" TBC part right. And Bill Carpenter
told the whole story not too long ago including how this fits with the
"quad that never was". I figured one of you guys would put the
pieces together!</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Don Norwood<BR>Digitrak Communications, Inc.<BR><A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/">www.digitrakcom.com</A>
</FONT></DIV>
<BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mailto:Chill315@aol.com href="mailto:Chill315@aol.com">Chill315@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 13, 2011 10:13
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] What is
it????</DIV>
<DIV><BR></DIV><FONT color=#000000 size=2 face=Arial>
<DIV>Yes I did notice that the module was missing the pull handle.
The card does have the 28 pin connector that the AVR-1 used. The
63.5 micro second delay line is used in the drop out compensator of the
AVR-1.</DIV>
<DIV> </DIV>
<DIV>The front connectors are what throw me for a loop. So I am at
a loss. </DIV>
<DIV> </DIV>
<DIV>It is for a quad you say so that does not leave much left.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/13/2011 10:09:05 P.M. Eastern Daylight Time,
dwnorwood@embarqmail.com writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV><FONT size=3>Hi Chris:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Almost a winning answer, maybe the best so
far.....but you'll notice that this module design (mechanical, not
electrical) is slightly different from the AVR-1.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Don Norwood<BR>Digitrak Communications, Inc.<BR><A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/">www.digitrakcom.com</A>
</FONT></DIV>
<BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mailto:Chill315@aol.com href="mailto:Chill315@aol.com">Chill315@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 13, 2011 9:54
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] What is
it????</DIV>
<DIV><BR></DIV><FONT color=#000000 size=2 face=Arial>
<DIV>This is the one line delay module that was used in the AVR-1 /
ACR-25. </DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV><FONT size=3></FONT> </DIV></FONT></BLOCKQUOTE><BR></FONT></BLOCKQUOTE></DIV></FONT></BLOCKQUOTE></FONT></BLOCKQUOTE></DIV></FONT></BLOCKQUOTE><BR><BR>_______________________________________________<BR>Please
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