<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Folks here is what to do to adjust the video head air switches, see PDF attached.<br>Ken Zin<br><br>--- On <b>Fri, 6/1/12, quadlist-request@quadvideotapegroup.com <i><quadlist-request@quadvideotapegroup.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: quadlist-request@quadvideotapegroup.com <quadlist-request@quadvideotapegroup.com><br>Subject: QuadList Digest, Vol 48, Issue 7<br>To: quadlist@quadvideotapegroup.com<br>Date: Friday, June 1, 2012, 10:00 AM<br><br><div class="plainMail">Send QuadList mailing list submissions to<br> <a ymailto="mailto:quadlist@quadvideotapegroup.com" href="/mc/compose?to=quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a><br><br>To subscribe or unsubscribe via the World Wide Web,
visit<br> <a href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com" target="_blank">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a><br><br>or, via email, send a message with subject or body 'help' to<br> <a ymailto="mailto:quadlist-request@quadvideotapegroup.com" href="/mc/compose?to=quadlist-request@quadvideotapegroup.com">quadlist-request@quadvideotapegroup.com</a><br><br>You can reach the person managing the list at<br> <a ymailto="mailto:quadlist-owner@quadvideotapegroup.com" href="/mc/compose?to=quadlist-owner@quadvideotapegroup.com">quadlist-owner@quadvideotapegroup.com</a><br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of QuadList digest..."<br><br><br>This is the Digest of the QuadList.<br>Trim your post to relevant info when replying.<br><br>Change subject to reflect
thread. Thanks.<br>_______________________________________________<br><br><br>That will keep the entire digest and a bunch of headers with gobblydgook from being re-sent to the list. Thanks.<br>_______________________________________________<br><br><br>Today's Topics:<br><br> 1. Re: Ampex Quad VTR Airflow Requirements (Roger Brett)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Fri, 01 Jun 2012 12:57:25 -0400<br>From: Roger Brett <<a ymailto="mailto:rcbindy@comcast.net" href="/mc/compose?to=rcbindy@comcast.net">rcbindy@comcast.net</a>><br>To: Quad List <<a ymailto="mailto:quadlist@quadvideotapegroup.com" href="/mc/compose?to=quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>><br>Subject: Re: [QuadList] Ampex Quad VTR Airflow Requirements<br>Message-ID: <<a ymailto="mailto:4FC8F475.4020106@comcast.net"
href="/mc/compose?to=4FC8F475.4020106@comcast.net">4FC8F475.4020106@comcast.net</a>><br>Content-Type: text/plain; charset=ISO-8859-1; format=flowed<br><br>Thanks Don, very helpful!!!<br><br>On 6/1/2012 10:10 AM, Don Norwood wrote:<br>> Hi Roger:<br>><br>> The air supply requirement for VR-1100/1200/2000 when equipped with the<br>> venturi update is between 50 & 55 psi at just under 1 scfm. When<br>> properly adjusted, the head air warning will come on above 55 or below<br>> 50 psi, and the head air interlock will cut out below 40 psi. Air supply<br>> must also be dry and oil-free.<br>><br>> For a single machine, a compressor that can deliver 1 scfm at 100 psi<br>> gives a comfortable cushion and a reasonable cycle time on the<br>> compressor when using a properly sized tank. Obviously, there are a<br>> number of variations of scfm/pressure/tank size that will yield<br>> acceptable results.<br>><br>>
The original Ampex and RCA approach was to use a compressor that was<br>> just slightly oversized, and it ran continuously with a relief valve.<br>> That works too, but I much prefer a "central air" design, even when<br>> using a single machine. Beware of cheaper oilless compressors which tend<br>> to run very hot and are not designed for continuous duty. My preferred<br>> brand is Gast, and you'll find a large variety of compressors if you<br>> check their website. The rocker style can be used for a single machine,<br>> but I still prefer the piston style and their higher output. Quietness<br>> (a relative term!) may also be a consideration depending on your situation.<br>><br>> If you have any specific questions, let me know.<br>><br>> Don Norwood<br>> Digitrak Communications, Inc.<br>> www.digitrakcom.com<br>><br>> ----- Original Message ----- From: "Roger Brett" <<a
ymailto="mailto:rcbindy@comcast.net" href="/mc/compose?to=rcbindy@comcast.net">rcbindy@comcast.net</a>><br>> To: <<a ymailto="mailto:quadlist@quadvideotapegroup.com" href="/mc/compose?to=quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>><br>> Sent: Friday, June 01, 2012 1:11 AM<br>> Subject: [QuadList] Ampex Quad VTR Airflow Requirements<br>><br>><br>>> Hi,<br>>> Does anyone have info regarding air system requirements for the<br>>> typical Ampex VR series quad machine? I'm planning the air supply<br>>> system for one fairly soon.<br>>><br>>> It's been quite a while since I maintained one of these, and I don't<br>>> seem to have this data on file.<br>>><br>>> I don't have physical access to the unit yet, but besides the air<br>>> bearings on the head, I believe it has a venturi system to generate<br>>> vacuum for the guide. This aspect would of
course increase the flow<br>>> requirements.<br>>><br>>> Data I'm trying to get:<br>>><br>>> - Max (worst case) CFM of airflow needed for bearings and venturi<br>>> combined<br>>> - Nominal air pressure needed at the head bearings for proper operation<br>>><br>>> Any help would be appreciated!<br>>><br>>> Thanks,<br>>><br>>> Roger Brett<br>>><br>>> Please trim posts to relevant info when replying.<br>>><br>>> Change subject to reflect thread direction. Thanks.<br>>> _______________________________________________<br>>><br>>> Send QuadList list posts to <a ymailto="mailto:QuadList@quadvideotapegroup.com" href="/mc/compose?to=QuadList@quadvideotapegroup.com">QuadList@quadvideotapegroup.com</a><br>>> Your subscribe, unsubscribe and digest options are here:<br>>> <a
href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com" target="_blank">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a><br>><br>><br>><br>> Please trim posts to relevant info when replying.<br>><br>> Change subject to reflect thread direction. Thanks.<br>> _______________________________________________<br>><br>> Send QuadList list posts to <a ymailto="mailto:QuadList@quadvideotapegroup.com" href="/mc/compose?to=QuadList@quadvideotapegroup.com">QuadList@quadvideotapegroup.com</a><br>> Your subscribe, unsubscribe and digest options are here:<br>> <a href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com"
target="_blank">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a><br>><br>><br><br><br><br>------------------------------<br><br>_______________________________________________<br>Send QuadList list posts to <a ymailto="mailto:QuadList@quadvideotapegroup.com" href="/mc/compose?to=QuadList@quadvideotapegroup.com">QuadList@quadvideotapegroup.com</a><br>Your subscribe, unsubscribe and digest options are here:<br><a href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com" target="_blank">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a><br><br>End of QuadList Digest, Vol 48, Issue 7<br>***************************************<br></div></blockquote></td></tr></table>