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<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 border=0 hspace=0 alt="" align=baseline
src="cid:948A3D504D9C4257A6B646BC4B2B226D@dcidell2v2"></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
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=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> 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 id=role_document 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
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>
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