<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16735" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY
style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"
bgColor=#ffffff>
<DIV>Yes, it was for 7.5 ips. It was used on all models up thru the
TR-22. I believe that most machines did use the air bearing version
though. I know that many of the TRT-1's were converted for air bearing
heads. A machine equipped for air bearing heads could also use the older
ball bearing heads. That was true for both RCA and Ampex.</DIV>
<DIV> </DIV>
<DIV>Don</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=ted@quadvideotapegroup.com
href="mailto:ted@quadvideotapegroup.com">Ted Langdell</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=quadlist@quadvideotapegroup.com
href="mailto:quadlist@quadvideotapegroup.com">Quad List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 20, 2008 10:14
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] RCA TRT Quad
Headwheel panel on ebay</DIV>
<DIV><BR></DIV>
<DIV>On Dec 20, 2008, at 5:57 PM, Don Norwood wrote:</DIV>
<DIV><BR class=Apple-interchange-newline>
<BLOCKQUOTE type="cite"><SPAN class=Apple-style-span
style="WORD-SPACING: 0px; FONT: 14px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0">
<DIV
style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"
bgcolor="#ffffff">
<DIV>Hi Ted:</DIV>
<DIV> </DIV>
<DIV>According to my RCA catalog, this part number is a 5-mil headwheel with
ball bearings. </DIV></DIV></SPAN></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>So this would likely have been used to record tapes at 7.5 ips?
</DIV>
<DIV><BR></DIV>
<DIV>What machines did it fit?</DIV>
<DIV><BR></DIV><BR>
<BLOCKQUOTE type="cite"><SPAN class=Apple-style-span
style="WORD-SPACING: 0px; FONT: 14px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0">
<DIV
style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"
bgcolor="#ffffff">
<DIV>A bit of headwheel trivia.......These lowband headwheels were offered
with either ball bearings or air bearings. I believe that RCA was the
first to offer air bearings, while Ampex was the first to offer rotary
transformers. RCA apparently continued to offer the lowband heads
after they developed their highband head. However, after Ampex
introduced the Mark Ten for highband, they no longer made their lowband
panels, but versions of the Mark Ten were available for low band. As
far as I know, there were never any of the Ampex lowband Mark Three panels
that had air bearings, but the Mark Ten was available either way to
accomodate machines without the air package.</DIV>
<DIV> </DIV>
<DIV>Don</DIV></DIV></SPAN></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV><BR></DIV>
<BLOCKQUOTE type="cite"><SPAN class=Apple-style-span
style="WORD-SPACING: 0px; FONT: 14px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0">
<DIV
style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"
bgcolor="#ffffff">
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message -----</DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND-COLOR: rgb(228,228,228); -webkit-background-clip: initial; -webkit-background-origin: initial"><B>From:</B><SPAN
class=Apple-converted-space> </SPAN><A title=ted@tedlangdell.com
href="mailto:ted@tedlangdell.com">Ted Langdell</A></DIV>
<DIV style="FONT: 10pt arial"><B>To:</B><SPAN
class=Apple-converted-space> </SPAN><A
title=quadlist@quadvideotapegroup.com
href="mailto:quadlist@quadvideotapegroup.com">Quad List</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B><SPAN
class=Apple-converted-space> </SPAN>Friday, December 19, 2008 10:14
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B><SPAN
class=Apple-converted-space> </SPAN>[QuadList] RCA TRT Quad Headwheel
panel on ebay</DIV>
<DIV><BR></DIV>
<DIV>This has apparently been on ebay for a while. </DIV>
<DIV><BR></DIV>
<DIV>RCA part MI-40791-AZ, serial 3203.</DIV>
<DIV><BR></DIV>
<DIV><FONT class=Apple-style-span color=#144fae><SPAN
class=Apple-style-span style="TEXT-DECORATION: underline"><A
href="http://cgi.ebay.com/Vintage-Quadruplex-VTR-Headwheel-RCA-TRT-Quad_W0QQitemZ230252354142QQcmdZViewItemQQptZVideo_recorders_Players?hash=item230252354142&_trksid=p3286.c0.m14&_trkparms=66%253A4%257C65%253A1%257C39%253A1%257C240%253A1318#ebayphotohosting">http://cgi.ebay.com/Vintage-Quadruplex-VTR-Headwheel-RCA-TRT-Quad_W0QQitemZ230252354142QQcmdZViewItemQQptZVideo_recorders_Players?hash=item230252354142&_trksid=p3286.c0.m14&_trkparms=66%253A4%257C65%253A1%257C39%253A1%257C240%253A1318#ebayphotohosting</A></SPAN></FONT></DIV>
<DIV><BR></DIV>
<DIV>Hope everyone is warm and dry... and doesn't suffer a power outage or
air loss while the headwheel is spinning. </DIV>
<DIV><BR></DIV>
<DIV>Ted</DIV></BLOCKQUOTE></DIV></SPAN></BLOCKQUOTE></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Send QuadList list
posts to QuadList@quadvideotapegroup.com<BR>Your subscribe, unsubscribe and
digest options are
here:<BR>http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</BLOCKQUOTE></BODY></HTML>