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<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> </DIV>
<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>
<BLOCKQUOTE
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ted@tedlangdell.com href="mailto:ted@tedlangdell.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> Friday, December 19, 2008 10:14
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [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><BR>
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