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<DIV>George</DIV>
<DIV> </DIV>
<DIV>Remember to change the strapping's on the 12 volt shunt regulator power
supplies. The power supply had to be strapped for the correct load or it
may go down. There is a procedure in the book that if we added
accessories, we had to change it. The one in the edit machine was strapped
differently so I had to make sure not to swap them.</DIV>
<DIV> </DIV>
<DIV>There were not tubes in the VR-1200 for the record amps. That was an
improvement that came along. Probably due to improvements in transistor
capabilities at the frequencies required. The 1200 pre-amps were
transistorized. It was interesting how AMPEX did the bit with the same
MK-X head for different series machines by just having interchangeable
pre-amps.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV>The </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 2/10/2011 10:36:58 A.M. Eastern Standard Time,
georgenann@aol.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><FONT color=black size=2 face=arial>
<DIV>The 1200 and 2000's had big hot record "Vlaves" in the RAPA's and
Nuvistors in the heads.</DIV>
<DIV> </DIV>
<DIV>At CBS in the "later Years" I pulled all the record amp tubes out and
threw them away. Also removed the fan in the head channel housing,
didn't need it, filter too, no need to replace it ever and less dirt being
slung around the place. Also the cabeling associated with record from the head
channel housing. Kept the modulator.</DIV>
<DIV> </DIV>
<DIV>I don't think anyone will be doing any 2" recording on those machines
anyway.</DIV>
<DIV> </DIV>
<DIV>Also pulled "Erase Head Chassis" and anything else I could find that
wasn't needed anymore.</DIV>
<DIV> </DIV>
<DIV>I would have pulled the Editec, Editor and VHO but couldn't find one of
the original "Dummy Plugs".</DIV>
<DIV> </DIV>
<DIV>I did the same on the last 2 AVR-1's located at "Archives".<BR></DIV>
<DIV>I just liked the "Clean Machine" look and anything that made getting
around the inside a bit easier made life a little "Better".<BR></DIV>
<DIV>Please don't tell any of my bosses, they might be mad. OH -
Nevermind, they have all retired, like me.</DIV>
<DIV> </DIV>
<DIV>George Keller</DIV>
<DIV style="CLEAR: both"></DIV><BR><BR>
<DIV style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original
Message-----<BR>From: Don Norwood <dwnorwood@embarqmail.com><BR>To: Quad
List <quadlist@quadvideotapegroup.com><BR>Sent: Thu, Feb 10, 2011 10:13
am<BR>Subject: Re: [QuadList] VTR introduction anniversaries: 1965<BR><BR>
<DIV id=AOLMsgPart_2_1920a9c3-38ae-4ee3-be5a-c8f7ff1b8243>
<DIV>Apparently you don't need recapping at all Guy! The record amps did
have tubes in the VR-2000, 3 in each channel!</DIV>
<DIV> </DIV>
<DIV>Don</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:quadruplex@verizon.net href="mailto:quadruplex@verizon.net">Guy Spiller</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">Quad List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 10, 2011 8:47
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] VTR
introduction anniversaries: 1965</DIV>
<DIV><BR></DIV>I seem to remember the VR-2000B that I worked with back in
the day, also had tubes in the four record amps....similar to the early
TR-70s. <BR>Seems like those big tube record amps were one of the
major differences between a 1200 and a 2000.<BR>But, then again, my memory
may need recapping.<BR>Guy<BR><BR>On 2/10/2011 8:39 AM, <A class=moz-txt-link-abbreviated title=mailto:Chill315@aol.com href="mailto:Chill315@aol.com">Chill315@aol.com</A> wrote:
<BLOCKQUOTE type="cite"><FONT color=#000000 size=2 face=Arial>
<DIV>I got the brains working a little better.</DIV>
<DIV> </DIV>
<DIV>The tubes in the VR-2000 were in the Mark 10 head pre-amp.
These were the four Nuvistors. Don't see those any more. The
manual that came with my 1200 talked about shorting bars in the head
pre-amp to reduce the gain. I have no idea how that worked.</DIV>
<DIV> </DIV>
<DIV>There TR-70 had a modification kit for the machine to replace a
tube driver in the record amps. It was something I remember the U of
M Dental school operator showed me. </DIV>
<DIV> </DIV>
<DIV>Those were the only tubes that I am aware of other than the scope and
monitors in the units. </DIV>
<DIV> </DIV>
<DIV>The audio was transistorized as stated in another reply. There
were several modification bulletins for this part of the machine.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 2/9/2011 11:12:09 P.M. Eastern Standard Time, <A class=moz-txt-link-abbreviated title=mailto:park@videopark.com href="mailto:park@videopark.com">park@videopark.com</A> writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT size=3></FONT> </BLOCKQUOTE></DIV></FONT></BLOCKQUOTE></BLOCKQUOTE></DIV><!-- end of AOLMsgPart_2_1920a9c3-38ae-4ee3-be5a-c8f7ff1b8243 -->
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