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<DIV>Xylene, Toluene, Trichloretylene all this stuff will give ya cancer
or drop your liver out of your body be careful my friends!</DIV>
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<DIV><FONT size=2 PTSIZE="10">
<DIV>ed#</DIV>
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<DIV>
<DIV>In a message dated 1/14/2010 3:55:53 P.M. US Mountain Standard Time,
park@videopark.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>A couple
of points about head clogs.
<DIV><BR></DIV>
<DIV>Oxide and binder comes off tape. Even if you look at an audio machine,
you can see oxide/binder on the heads and guides that came from the oxide side
of the tape.</DIV>
<DIV><BR></DIV>
<DIV>We have found that baking the tape (both audio and video) lessens or
eliminates oxide and backcoating shedding (SSS - Sticky Shed Syndrome). SSS is
caused <SPAN style="LINE-HEIGHT: 19px; FONT-FAMILY: sans-serif; FONT-SIZE: 13px" class=Apple-style-span>by absorption of moisture into the binder of the tape,
making it sticky.</SPAN></DIV>
<DIV><BR></DIV>
<DIV>Yes, you need to clean the heads on a quad to remove the oxide layer.
When cleaning, you can see the oxide on your cleaning cloth. The oxide and
binder material would short out the gap of the head or lessen its penetration
into the tape due to buildup on the head surface.</DIV>
<DIV><BR></DIV>
<DIV>The official Amex Head Cleaner was made from Xylene, not Toluene.</DIV>
<DIV><BR></DIV>
<DIV>"The recommended solvent is Ampex Head Cleaner (Cat 087-007) which is
composed of 98% and a dash of "Kodaflow", which is a wetting agent
intended to enhance the flow of the solvent in restricted areas."<BR><BR>I
understand <FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span>the TCE is to speed up evaporation. I don't remember
seeing any other chemical recommended by Ampex. Alcohol was the suggestion for
cleaning the pinch roller. </SPAN></FONT></DIV>
<DIV><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span><BR></SPAN></FONT></DIV>
<DIV><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span>In modern VTRs like Digital Betacam that uses metal
tape, a cleaning tape is necessary to remove metal particles that get imbedded
in the heads since regular chemistry will not dissolve the metal particles.
Sony recommends using a cleaning tape for five seconds every 50 hours of
use.</SPAN></FONT></DIV>
<DIV><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span><BR></SPAN></FONT></DIV>
<DIV><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span>Tape binders were/are made from polymers like polyvinyl
chloride, polyurethane resin and a copolymer of vinylidene chloride and
acrylonitrile, </SPAN></FONT><SPAN style="LINE-HEIGHT: 14px" class=Apple-style-span><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span>polyester urethane and the
like. I don't think any tape ever used Latex (rubber) as a
binder.</SPAN></FONT></SPAN></DIV>
<DIV><FONT class=Apple-style-span size=3><SPAN style="FONT-SIZE: 12px" class=Apple-style-span><BR></SPAN></FONT>
<DIV><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: medium Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -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: 0px" class=Apple-style-span><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: 12px Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -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: 0px" class=Apple-style-span>
<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: 12px Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto" class=Apple-style-span>
<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: 12px Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto" class=Apple-style-span>
<DIV>
<DIV>The old "thumbnail" trick on Quad was to loosen any foreign matter and
the 14,000 rpm speed of the head would throw it off.</DIV>
<DIV><BR></DIV>
<DIV>The 3M tape reels that had the foam on one flange had a problem of glue
migrating through the foam and onto the tape. The glue did not come from the
tape since after transferring the tape to a clean reel, the reel remained
clean.</DIV>
<DIV><BR class=Apple-interchange-newline>Best,</DIV>
<DIV>Park</DIV>
<DIV><BR></DIV></DIV>
<DIV>C. Park Seward</DIV>
<DIV>Visit us: <A title=http://www.videopark.com/ href="http://www.videopark.com/">http://www.videopark.com</A></DIV><BR class=Apple-interchange-newline></SPAN></DIV></SPAN></DIV></SPAN><BR class=Apple-interchange-newline></SPAN><BR class=Apple-interchange-newline></DIV><BR>
<DIV>
<DIV>On Jan 14, 2010, at 12:30 PM, <A title=mailto:georgenann@aol.com href="mailto:georgenann@aol.com">georgenann@aol.com</A> wrote:</DIV><BR class=Apple-interchange-newline>
<BLOCKQUOTE type="cite"><FONT color=black size=2 face=arial>
<DIV style="FONT-FAMILY: helvetica,arial; COLOR: black; FONT-SIZE: 10pt">
<DIV id=AOLMsgPart_2_552fcb31-37be-4164-8a61-96b4a527b3b1><FONT color=black size=2 face=arial>
<DIV id=AOLMsgPart_2_0c3a50fb-9a98-4997-8143-3522f608becf><FONT color=black size=2 face=arial>
<DIV><FONT face="Arial, Helvetica, sans-serif">I think there are many
people who are under the impression that "Head Clogs" come from oxide being
stuck in the gap of the heads.</FONT></DIV>
<DIV> </DIV>
<DIV>I'm not sure this is the case. There may be some instances of
this, but one of the common cures for an "On Air" head clog is putting your
thumbnail against the head, which works most of the time. Seems to me
that would tend to push anything into the head, not out of it.</DIV>
<DIV> </DIV>
<DIV>I think it is more a case of the latex binder oozing from the tape
and sticking to the head rim, causing "Rim Buildup" and keeping the tape
away from the head.</DIV>
<DIV> </DIV>
<DIV>One of the other "Cures" for this is squirting Freon (TF) into the head
while it is running. In this case, Freon is a refrigerant and due to the
high speed of the head immediately freezes the latex and it breaks off,
there is such a small amount of it you would hardly notice it, thereby
relieving the problem.</DIV>
<DIV> </DIV>
<DIV>This "Oozing" of the latex binder has become quite obvious over the
past number of years with the older 2" tapes. It is all over the
place. In a few minutes of playing a tape, there may be a buildup of
this latex on the audio stack, full erase head, (Don't forget that is on the
back of the tape) fixed guides and all over the vac cols, stuck to the glass
and the entrance and exit guides thereof. This will cause the machine
to just STOP! This is also a big problem on 2000's and 1200's.
One can actually feel the stuff, even on the head wheel where it causes
"Head Clogs". In the AVR-1's one can also feel the stuff on the glass
in the vac cols. </DIV>
<DIV> </DIV>
<DIV>
<DIV>The only thing to do is stop and clean the stuff off of
everything.</DIV></DIV>
<DIV> </DIV>
<DIV>Years ago, I thought I would try cleaning it up with some "Rubber
Cement Thinner" which had been in a closet in one of the secretary's
offices. It did the trick. </DIV>
<DIV> </DIV>
<DIV>Later, one of my neighbors who worked for "Tessa Tape" in Middletown,
NY gave me some "Toluene" as they use it as a latex thinner in the
manufacturing process. It worked like a charm, it dissolved the
damn latex immediately. I was hooked on the stuff. I highly
recommend it to everyone. It won't hurt anything on the machine, or
plastic, but I would keep it away from pucks as they are made of
rubber. Also it is a good idea to use it in a well ventilated
area</DIV>
<DIV> </DIV>
<DIV>The best way to clean the pimpled glasses in the vac <A title=http://cols.is/ href="http://cols.is/">cols.is</A> to really saturate
a cloth with Toluene and wash it out, floating the stuff away. Also
the bottom edges of the entrance and exit guides of the vac cols need to be
done with a Q-Tip as small unseen bits of latex like to live in
there.</DIV>
<DIV> </DIV>
<DIV>My test to assure that the latex is completely gone is to thread the
machine up, put it in ready and manually turn the capstan both ways.The
whole thing, tape, and both reels should move freely, no sticking in
either direction and no "Squeaking".</DIV>
<DIV> </DIV>
<DIV>Now the same problem and Toluene cure applies to everything up to and
including the Digibetas. The U-Matics seem to have a problem with tape
coming around the guide <U>inside</U> of the cassette (Just under the
cover) causing the tape to either slow down or come to a complete
stop. A little Toluene on a Q-Tip at that guide will amaze you.
I also recommend cleaning the tape guides audio stacks, etc. on the
1100's and 2000's and for that matter all machines,especially before
attempting to adjust the tape guides, you may save yourself a lot of
work.</DIV>
<DIV> </DIV>
<DIV>I understand Toluene may be hard to obtain, as it may be considered a
dangerous chemical. At first I ordered a gallon from Cole-Parmer in
Chicago. They sent it in a glass gallon jug in a cardboard box -
Not a good idea. If someone dropped it they would have had to evacuate
the whole building after it got into the air conditioning system.
After that I bought it in pint cans at a True Value hardware store in Pa.,
right across the river from Port Jervis,NY. as it is a common paint
thinner. (Home Depot doesn't carry it in NY, NJ, or Pa. nor does
Lowes.) It only costs about $3.50 or so, not bad for about $500.00
worth of "Ampex Head Cleaner." I have further learned that Pa. is
somewhat lax of the dangerous chemicals possibly due to the "Hot-Rod"
industry in that state.</DIV>
<DIV> </DIV>
<DIV>Don't forget what <U><STRONG>T</STRONG></U>ri -
<U><STRONG>N</STRONG></U>itro - <U><STRONG>T</STRONG></U>oluene will do for
you.</DIV>
<DIV> </DIV>
<DIV>One day there was a delegation from Sony in the shop, shortly after the
Digibetas arrived, we had a problem with heads and some of the guys were
replacing them like hot cakes. The toluene cured them, but they still
wanted to replace the heads, around 5 kb a pop.</DIV>
<DIV> </DIV>
<DIV>One of the Sony guys was the head of the Sony Tape Plant in Ala.
When I told him about using Toluene, he hit the roof went into a
rage about how terrible it was, I was nuts, and on and on.</DIV>
<DIV> </DIV>
<DIV>I asked him what the Zip code of the tape plant is, and he gave it to
me. Now there is a Web site called "Score Card", in which you put in a
Zip code and it will tell you who the polluters in that area are, and what
they are polluting with. Well, it came up with the Sony Tape Plant as
being one of the top ten polluters in the country of Toluene. (
<A title=http://scorecard.org/env-releases/facility.tcl?tri_id=36301SNYMGHWY84 href="http://scorecard.org/env-releases/facility.tcl?tri_id=36301SNYMGHWY84" target=_blank>http://scorecard.org/env-releases/facility.tcl?tri_id=36301SNYMGHWY84</A>).
I see now that they have changed to Cobalt as their major pollutant,
but (<A title="http://oaspub.epa.gov/enviro/multisys2.get_list_tri?tri_fac_id=36301SNYMGHWY84) tells" href="http://oaspub.epa.gov/enviro/multisys2.get_list_tri?tri_fac_id=36301SNYMGHWY84)%20tells" target=_blank>http://oaspub.epa.gov/enviro/multisys2.get_list_tri?tri_fac_id=36301SNYMGHWY84)
tells</A> me they still spew quite a bit of Toluene into the air. If
you think he was mad earlier in the day, you should have seen him after I
showed him that. Score Card also showed my neighbor's plant (Tessa
Tape) in Middletown, NY also as being in the top 10% of Touluene polluters
also.( see <A title=http://scorecard.org/env-releases/facility.tcl?tri_id=10940TSTCKCROTT#major_chemical_releases href="http://scorecard.org/env-releases/facility.tcl?tri_id=10940TSTCKCROTT#major_chemical_releases" target=_blank>http://scorecard.org/env-releases/facility.tcl?tri_id=10940TSTCKCROTT#major_chemical_releases</A>)
The Middletown Tessa Tape plant has since shut down and moved to Ala.
because of the pollution laws</DIV>
<DIV> </DIV>
<DIV>I recall times where there was some "Glue" stuck on the foam rubber
liners on some 1" tape reels. I wonder if this might also be leaking
latex binder from the tape, and not the glue holding the rubber to the
reels. It has also happened on some 2" reels with that type of liner.
Keeping in mind the amount of pressure on the wound tape and the
position of the "Glue" (Not on the outer edges of the reel) this
may be the case.</DIV>
<DIV> </DIV>
<DIV>To top it all off, I was in the "Lab" across the street from CBS in the
basement of the same building as Archives is located, bullshooting with one
of the "Old Timers" who has been a senior engineer with the labs
since before anyone ever heard of video tape. I mentioned my exploits
with Toluene and he was all over me telling me "That's How We Did it Years
Ago".</DIV>
<DIV> </DIV>
<DIV>Was wondering if anyone else has had similar experiences??</DIV>
<DIV> </DIV>
<DIV>73,</DIV>
<DIV> </DIV>
<DIV>George Keller</DIV>
<DIV style="CLEAR: both"></DIV></FONT></DIV></FONT></DIV></DIV></FONT></BLOCKQUOTE></DIV><BR></DIV>=<BR><BR>_______________________________________________<BR>Please
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