From lasvegastvengineer at yahoo.com  Mon Aug  1 16:11:57 2011
From: lasvegastvengineer at yahoo.com (lee williams)
Date: Mon, 1 Aug 2011 14:11:57 -0700 (PDT)
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <598000578.1571034.1312120699936.JavaMail.root@md38.embarq.synacor.com>
Message-ID: <1312233117.66819.YahooMailClassic@web37905.mail.mud.yahoo.com>

Hello Larry, 
?
Sorry but not the problem, 
?
The closest thing I can describe the effect is white streaks with analog snow in them trailing out like a comet tail from the trailing edge of anything white in the picture. 
?
No digital?blocks, Not a head clog. 

Thanks. 
?
Lee 
?

--- On Sun, 7/31/11, LARRY <leodham at centurylink.net> wrote:


From: LARRY <leodham at centurylink.net>
Subject: Re: [QuadList] AVR 3 heads question
To: "Quad List" <quadlist at quadvideotapegroup.com>
Date: Sunday, July 31, 2011, 6:58 AM



#yiv981461483 p {margin:0;}


Hello Lee,
?
I have been following some of the back-and-fourth e-mails on your tape playback trouble.
Here is my two cents worth:
?
?I have experienced this problem before.
The video is tearing in what looks to be square blocks? right??
I have encountered that very same effect here on a VR-1200b. It was caused here by the playback equalization. A good way to verify if this is the problem is to go to manual equalization, and turn down(reduce) the EQ one channel at a time. If you see an improvement, then stop the machine, unthread the tape, and look with a magnifier at the drum surface behind each head tip(trailing surface). You may find a small build-up of black-looking stuff behind one, or all, of the head tips?on the drum edge surface itself. 
This build-up increases the diameter of the head drum just enough to decrease tip penetration at the head.
Usual cleaning of the tips will not remove this buildup. Alcohol and a fingernail will. CAREFULLY!!
?
?OK, hope this helps,
larry
----- Original Message -----
From: "lee williams" <lasvegastvengineer at yahoo.com>
To: "Quad List" <quadlist at quadvideotapegroup.com>
Sent: Sunday, July 31, 2011 12:24:33 AM
Subject: Re: [QuadList] AVR 3 heads question






Hello, 
Answers below questions. 
?


--- On Sat, 7/30/11, Chill315 at aol.com <Chill315 at aol.com> wrote:


From: Chill315 at aol.com <Chill315 at aol.com>
Subject: Re: [QuadList] AVR 3 heads question
To: quadlist at quadvideotapegroup.com
Date: Saturday, July 30, 2011, 9:38 AM



Lee
?
How does the RF envelope look on the scope?
No Scope - I can tell I have plenty of RF with my tracking adjustment. 
?
?
How is Vertical lining up with house?
AVR3 is on internal generator. No difference if I hook up a black source to the machines. 
?
?
Do you have an alignment tape?? If so, how does it play and where is the tracking knob?
Alignment and known good tapes play fine. 
Client has several thousand tapes made in the early 80's (probably on a VR2000) 
?
Are you using manual or auto tracking?
Manual normally.? No difference in auto. 
?
30 lines of black may be that you are one or two head passes off in the vertical realm.? The tearing may be due to the fact that you can not get the head centered on the track perfectly.? 
?
The head assemblies are made so good that they meet SMPTE specifications with in a few hairs.? This is to create interchangeability between machines.? 
?
I would not touch the heads in any way as you will destroy the interchange.? It is a critical factor.? If you saw the recent slide show on here, you see the great deal of care taken to make a head.
?
Now the tape you have may have been done in a non standard method.? That is why all the questions.? 
?
I always assume that the tape was poorly made.? Many operations did not do best practices and thus there is a lot of poorly made tapes.? 
?
I know it's the tape that is off. (several thousand of them) 
Now how do I get them transferred short of sending in the weak head to the rebuilder and have him duplicate the deviation were the head is off of true? 
?
Chris Hill
WA8IGN
?

In a message dated 7/30/2011 11:56:38 A.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes:





Hay all, 
Have a good one here ??? 

AVR3 Mark XV heads. 

Have some 2" tape that when you try to pull it through the machine will will give you something that looks like video tearing in the whites and slow horizontal jitter. 

If I slam the tracking all the way down, I get a very clean picture, but about 30 lines of black overhead on the screen. 

I see this on all my new(er) heads I get from both Aheadtek and VideoMagnetics. 

I have 1 very warn out head (supplier unknown) that will lock to these tapes

Has anybody seen this before and is there a way this heads set up can be duplicated? 

Thanks 

Lee 



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From Chill315 at aol.com  Mon Aug  1 16:13:23 2011
From: Chill315 at aol.com (Chill315 at aol.com)
Date: Mon, 1 Aug 2011 17:13:23 -0400 (EDT)
Subject: [QuadList] AVR 3 heads question
Message-ID: <4e333.21bc600.3b6870f3@aol.com>

Lee
 
What does the Demod out look like?
 
Chris Hill
 
 
In a message dated 8/1/2011 5:12:28 P.M. Eastern Daylight Time,  
lasvegastvengineer at yahoo.com writes:

Hello Larry, 
 
Sorry but not the problem, 
 
The closest thing I can describe the effect is white streaks with  analog 
snow in them trailing out like a comet tail from the trailing  edge of 
anything white in the picture. 
 
No digital blocks, Not a head clog. 

Thanks. 
 
Lee 
 

--- On Sun, 7/31/11, LARRY  <leodham at centurylink.net> wrote:



From:  LARRY <leodham at centurylink.net>
Subject: Re: [QuadList]  AVR 3 heads question
To: "Quad List"  <quadlist at quadvideotapegroup.com>
Date: Sunday, July 31,  2011, 6:58 AM

  
 
Hello Lee,
 
I have been following some of the back-and-fourth e-mails on your  tape 
playback trouble.
Here is my two cents worth:
 
 I have experienced this problem before.
The video is tearing in what looks to be square blocks?  right??
I have encountered that very same effect here on a VR-1200b. It  was caused 
here by the playback equalization. A good way to verify if  this is the 
problem is to go to manual equalization, and turn  down(reduce) the EQ one 
channel at a time. If you see an improvement,  then stop the machine, unthread 
the tape, and look with a magnifier at  the drum surface behind each head 
tip(trailing surface). You may find  a small build-up of black-looking stuff 
behind one, or all, of the  head tips on the drum edge surface itself. 
This build-up increases the diameter of the head drum just enough  to 
decrease tip penetration at the head.
Usual cleaning of the tips will not remove this buildup. Alcohol  and a 
fingernail will. CAREFULLY!!
 
 OK, hope this helps,
larry
----- Original Message -----
From: "lee williams"  <lasvegastvengineer at yahoo.com>
To: "Quad List"  <quadlist at quadvideotapegroup.com>
Sent: Sunday, July 31, 2011  12:24:33 AM
Subject: Re: [QuadList] AVR 3 heads  question


Hello, 
Answers below questions. 
 


--- On Sat, 7/30/11, Chill315 at aol.com  <Chill315 at aol.com> wrote:



From:  Chill315 at aol.com <Chill315 at aol.com>
Subject: Re:  [QuadList] AVR 3 heads question
To:  quadlist at quadvideotapegroup.com
Date: Saturday, July 30,  2011, 9:38 AM


Lee
 
How does the RF envelope look on the scope?
No Scope - I can tell I have plenty of RF with my  tracking adjustment. 
 
 
How is Vertical lining up with house?
AVR3 is on internal generator. No difference if I hook up  a black source 
to the machines. 
 
 
Do you have an alignment tape?  If so, how does it  play and where is the 
tracking knob?
Alignment and known good tapes play fine. 
Client has several thousand tapes made in the early 80's  (probably on a 
VR2000) 
 
Are you using manual or auto tracking?
Manual normally.  No difference in auto. 
 
30 lines of black may be that you are one or two head  passes off in the 
vertical realm.  The tearing may be due  to the fact that you can not get the 
head centered on the  track perfectly.  
 
The head assemblies are made so good that they meet SMPTE  specifications 
with in a few hairs.  This is to create  interchangeability between machines. 
 
 
I would not touch the heads in any way as you will  destroy the 
interchange.  It is a critical factor.   If you saw the recent slide show on here, you 
see the great  deal of care taken to make a head.
 
Now the tape you have may have been done in a non  standard method.  That 
is why all the questions.   

I always assume that the tape was poorly made.  Many  operations did not do 
best practices and thus there is a lot  of poorly made tapes.  
 
I know it's the tape that is off. (several thousand of  them) 
Now how do I get them transferred short of sending in the  weak head to the 
rebuilder and have him duplicate the  deviation were the head is off of 
true? 
 
Chris Hill
WA8IGN
 
 
In a message dated 7/30/2011 11:56:38 A.M. Eastern  Daylight Time, 
lasvegastvengineer at yahoo.com writes:


Hay all, 
Have a good one here  ??? 

AVR3 Mark XV heads. 

Have some 2"  tape that when you try to pull it through the machine  will 
will give you something that looks like video  tearing in the whites and slow 
horizontal jitter.  

If I slam the tracking all the way down, I get  a very clean picture, but 
about 30 lines of black  overhead on the screen. 

I see this on all my  new(er) heads I get from both Aheadtek and  
VideoMagnetics. 

I have 1 very warn out head  (supplier unknown) that will lock to these  
tapes

Has anybody seen this before and is there  a way this heads set up can be 
duplicated?  

Thanks 

Lee  



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From quadruplex at verizon.net  Mon Aug  1 16:13:18 2011
From: quadruplex at verizon.net (Guy Spiller)
Date: Mon, 01 Aug 2011 17:13:18 -0400
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <1312233117.66819.YahooMailClassic@web37905.mail.mud.yahoo.com>
References: <1312233117.66819.YahooMailClassic@web37905.mail.mud.yahoo.com>
Message-ID: <4E3716EE.1080508@verizon.net>

Sounds like it resembles the way a high band recording plays in low band 
mode.  Is the recording possibly super high band?

On 8/1/2011 5:11 PM, lee williams wrote:
> Hello Larry,
> Sorry but not the problem,
> The closest thing I can describe the effect is white streaks with 
> analog snow in them trailing out like a comet tail from the trailing 
> edge of anything white in the picture.
> No digital blocks, Not a head clog.
> Thanks.
> Lee
>
> --- On *Sun, 7/31/11, LARRY /<leodham at centurylink.net>/* wrote:
>
>
>     From: LARRY <leodham at centurylink.net>
>     Subject: Re: [QuadList] AVR 3 heads question
>     To: "Quad List" <quadlist at quadvideotapegroup.com>
>     Date: Sunday, July 31, 2011, 6:58 AM
>
>     Hello Lee,
>     I have been following some of the back-and-fourth e-mails on your
>     tape playback trouble.
>     Here is my two cents worth:
>      I have experienced this problem before.
>     The video is tearing in what looks to be square blocks? right??
>     I have encountered that very same effect here on a VR-1200b. It
>     was caused here by the playback equalization. A good way to verify
>     if this is the problem is to go to manual equalization, and turn
>     down(reduce) the EQ one channel at a time. If you see an
>     improvement, then stop the machine, unthread the tape, and look
>     with a magnifier at the drum surface behind each head tip(trailing
>     surface). You may find a small build-up of black-looking stuff
>     behind one, or all, of the head tips on the drum edge surface itself.
>     This build-up increases the diameter of the head drum just enough
>     to decrease tip penetration at the head.
>     Usual cleaning of the tips will not remove this buildup. Alcohol
>     and a fingernail will. CAREFULLY!!
>      OK, hope this helps,
>     larry
>     ----- Original Message -----
>     From: "lee williams" <lasvegastvengineer at yahoo.com>
>     To: "Quad List" <quadlist at quadvideotapegroup.com>
>     Sent: Sunday, July 31, 2011 12:24:33 AM
>     Subject: Re: [QuadList] AVR 3 heads question
>
>     Hello,
>     Answers below questions.
>
>
>     --- On *Sat, 7/30/11, Chill315 at aol.com /<Chill315 at aol.com>/* wrote:
>
>
>         From: Chill315 at aol.com <Chill315 at aol.com>
>         Subject: Re: [QuadList] AVR 3 heads question
>         To: quadlist at quadvideotapegroup.com
>         Date: Saturday, July 30, 2011, 9:38 AM
>
>         Lee
>         How does the RF envelope look on the scope?
>         No Scope - I can tell I have plenty of RF with my tracking
>         adjustment.
>         How is Vertical lining up with house?
>         AVR3 is on internal generator. No difference if I hook up a
>         black source to the machines.
>         Do you have an alignment tape?  If so, how does it play and
>         where is the tracking knob?
>         Alignment and known good tapes play fine.
>         Client has several thousand tapes made in the early 80's
>         (probably on a VR2000)
>         Are you using manual or auto tracking?
>         Manual normally.  No difference in auto.
>         30 lines of black may be that you are one or two head passes
>         off in the vertical realm.  The tearing may be due to the fact
>         that you can not get the head centered on the track perfectly.
>         The head assemblies are made so good that they meet SMPTE
>         specifications with in a few hairs.  This is to create
>         interchangeability between machines.
>         I would not touch the heads in any way as you will destroy the
>         interchange.  It is a critical factor.  If you saw the recent
>         slide show on here, you see the great deal of care taken to
>         make a head.
>         Now the tape you have may have been done in a non standard
>         method.  That is why all the questions.
>         I always assume that the tape was poorly made.  Many
>         operations did not do best practices and thus there is a lot
>         of poorly made tapes.
>         I know it's the tape that is off. (several thousand of them)
>         Now how do I get them transferred short of sending in the weak
>         head to the rebuilder and have him duplicate the deviation
>         were the head is off of true?
>         Chris Hill
>         WA8IGN
>         In a message dated 7/30/2011 11:56:38 A.M. Eastern Daylight
>         Time, lasvegastvengineer at yahoo.com writes:
>
>
>             Hay all,
>             Have a good one here ???
>
>             AVR3 Mark XV heads.
>
>             Have some 2" tape that when you try to pull it through the
>             machine will will give you something that looks like video
>             tearing in the whites and slow horizontal jitter.
>
>             If I slam the tracking all the way down, I get a very
>             clean picture, but about 30 lines of black overhead on the
>             screen.
>
>             I see this on all my new(er) heads I get from both
>             Aheadtek and VideoMagnetics.
>
>             I have 1 very warn out head (supplier unknown) that will
>             lock to these tapes
>
>             Has anybody seen this before and is there a way this heads
>             set up can be duplicated?
>
>             Thanks
>
>             Lee
>
>
>
>             _______________________________________________
>             Please trim posts to relevant info when replying!
>             Send QuadList list posts to QuadList at quadvideotapegroup.com
>             Your subscribe, unsubscribe and digest options are here:
>             http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com
>
>
>         -----Inline Attachment Follows-----
>
>         _______________________________________________
>         Please trim posts to relevant info when replying!
>         Send QuadList list posts to QuadList at quadvideotapegroup.com
>         <http://us.mc379.mail.yahoo.com/mc/compose?to=QuadList at quadvideotapegroup.com>
>         Your subscribe, unsubscribe and digest options are here:
>         http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com
>
>
>     _______________________________________________
>     Please trim posts to relevant info when replying!
>     Send QuadList list posts to QuadList at quadvideotapegroup.com
>     Your subscribe, unsubscribe and digest options are here:
>     http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com
>
>     -----Inline Attachment Follows-----
>
>     _______________________________________________
>     Please trim posts to relevant info when replying!
>     Send QuadList list posts to QuadList at quadvideotapegroup.com
>     <http://us.mc379.mail.yahoo.com/mc/compose?to=QuadList at quadvideotapegroup.com>
>     Your subscribe, unsubscribe and digest options are here:
>     http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com
>
>
>
> _______________________________________________
> Please trim posts to relevant info when replying!
> Send QuadList list posts to QuadList at quadvideotapegroup.com
> Your subscribe, unsubscribe and digest options are here:
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>
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 10.0.1390 / Virus Database: 1518/3803 - Release Date: 08/01/11
>

-- 
Guy Spiller
email: quadruplex at verizon.net
phone: (804) 379-2050
website: www.GuySpiller.com
Midlothian, VA

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From lasvegastvengineer at yahoo.com  Mon Aug  1 16:23:32 2011
From: lasvegastvengineer at yahoo.com (lee williams)
Date: Mon, 1 Aug 2011 14:23:32 -0700 (PDT)
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <0D56E2B2-A0BC-4C47-A55D-E245D8189D47@quadvideotapegroup.com>
Message-ID: <1312233812.71263.YahooMailClassic@web37901.mail.mud.yahoo.com>

Thanks Ted, 
?
Don't have any kind of gages to test the heads. 
?
I can tell that my #2 head is on its way out. 
Been threatening for some time now. 
?
Lee 

--- On Sun, 7/31/11, Ted Langdell <ted at quadvideotapegroup.com> wrote:


From: Ted Langdell <ted at quadvideotapegroup.com>
Subject: Re: [QuadList] AVR 3 heads question
To: "Quad List" <quadlist at quadvideotapegroup.com>
Date: Sunday, July 31, 2011, 9:36 AM





On Jul 30, 2011, at 8:55 AM, lee williams wrote:

I have 1 very worn out head (supplier unknown) that will lock to these tapes.

Just curious to know if you have been able to measure the head(s) with a gauge? ?If so, what did you find?
That info might be helpful to folks on the list.


Ted




Ted Langdell
Secretary


-----Inline Attachment Follows-----


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From lasvegastvengineer at yahoo.com  Mon Aug  1 16:34:00 2011
From: lasvegastvengineer at yahoo.com (lee williams)
Date: Mon, 1 Aug 2011 14:34:00 -0700 (PDT)
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <4e333.21bc600.3b6870f3@aol.com>
Message-ID: <1312234440.48160.YahooMailClassic@web37902.mail.mud.yahoo.com>

You see the same tearing in demod that you see in the output. 
?
?
?
?
--- On Mon, 8/1/11, Chill315 at aol.com <Chill315 at aol.com> wrote:


From: Chill315 at aol.com <Chill315 at aol.com>
Subject: Re: [QuadList] AVR 3 heads question
To: quadlist at quadvideotapegroup.com
Date: Monday, August 1, 2011, 2:13 PM



Lee
?
What does the Demod out look like?
?
Chris Hill
?

In a message dated 8/1/2011 5:12:28 P.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes:





Hello Larry, 
?
Sorry but not the problem, 
?
The closest thing I can describe the effect is white streaks with analog snow in them trailing out like a comet tail from the trailing edge of anything white in the picture. 
?
No digital?blocks, Not a head clog. 

Thanks. 
?
Lee 
?

--- On Sun, 7/31/11, LARRY <leodham at centurylink.net> wrote:


From: LARRY <leodham at centurylink.net>
Subject: Re: [QuadList] AVR 3 heads question
To: "Quad List" <quadlist at quadvideotapegroup.com>
Date: Sunday, July 31, 2011, 6:58 AM



#yiv1073654117  p {margin:0;}


Hello Lee,
?
I have been following some of the back-and-fourth e-mails on your tape playback trouble.
Here is my two cents worth:
?
?I have experienced this problem before.
The video is tearing in what looks to be square blocks? right??
I have encountered that very same effect here on a VR-1200b. It was caused here by the playback equalization. A good way to verify if this is the problem is to go to manual equalization, and turn down(reduce) the EQ one channel at a time. If you see an improvement, then stop the machine, unthread the tape, and look with a magnifier at the drum surface behind each head tip(trailing surface). You may find a small build-up of black-looking stuff behind one, or all, of the head tips?on the drum edge surface itself. 
This build-up increases the diameter of the head drum just enough to decrease tip penetration at the head.
Usual cleaning of the tips will not remove this buildup. Alcohol and a fingernail will. CAREFULLY!!
?
?OK, hope this helps,
larry
----- Original Message -----
From: "lee williams" <lasvegastvengineer at yahoo.com>
To: "Quad List" <quadlist at quadvideotapegroup.com>
Sent: Sunday, July 31, 2011 12:24:33 AM
Subject: Re: [QuadList] AVR 3 heads question






Hello, 
Answers below questions. 
?


--- On Sat, 7/30/11, Chill315 at aol.com <Chill315 at aol.com> wrote:


From: Chill315 at aol.com <Chill315 at aol.com>
Subject: Re: [QuadList] AVR 3 heads question
To: quadlist at quadvideotapegroup.com
Date: Saturday, July 30, 2011, 9:38 AM



Lee
?
How does the RF envelope look on the scope?
No Scope - I can tell I have plenty of RF with my tracking adjustment. 
?
?
How is Vertical lining up with house?
AVR3 is on internal generator. No difference if I hook up a black source to the machines. 
?
?
Do you have an alignment tape?? If so, how does it play and where is the tracking knob?
Alignment and known good tapes play fine. 
Client has several thousand tapes made in the early 80's (probably on a VR2000) 
?
Are you using manual or auto tracking?
Manual normally.? No difference in auto. 
?
30 lines of black may be that you are one or two head passes off in the vertical realm.? The tearing may be due to the fact that you can not get the head centered on the track perfectly.? 
?
The head assemblies are made so good that they meet SMPTE specifications with in a few hairs.? This is to create interchangeability between machines.? 
?
I would not touch the heads in any way as you will destroy the interchange.? It is a critical factor.? If you saw the recent slide show on here, you see the great deal of care taken to make a head.
?
Now the tape you have may have been done in a non standard method.? That is why all the questions.? 
?
I always assume that the tape was poorly made.? Many operations did not do best practices and thus there is a lot of poorly made tapes.? 
?
I know it's the tape that is off. (several thousand of them) 
Now how do I get them transferred short of sending in the weak head to the rebuilder and have him duplicate the deviation were the head is off of true? 
?
Chris Hill
WA8IGN
?

In a message dated 7/30/2011 11:56:38 A.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes:





Hay all, 
Have a good one here ??? 

AVR3 Mark XV heads. 

Have some 2" tape that when you try to pull it through the machine will will give you something that looks like video tearing in the whites and slow horizontal jitter. 

If I slam the tracking all the way down, I get a very clean picture, but about 30 lines of black overhead on the screen. 

I see this on all my new(er) heads I get from both Aheadtek and VideoMagnetics. 

I have 1 very warn out head (supplier unknown) that will lock to these tapes

Has anybody seen this before and is there a way this heads set up can be duplicated? 

Thanks 

Lee 



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From leodham at centurylink.net  Mon Aug  1 16:45:10 2011
From: leodham at centurylink.net (LARRY)
Date: Mon, 1 Aug 2011 17:45:10 -0400 (EDT)
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <1759018001.1629397.1312234852663.JavaMail.root@md38.embarq.synacor.com>
Message-ID: <1531235796.1629546.1312235110933.JavaMail.root@md38.embarq.synacor.com>



Well, Golly Lee, 

It never is anything simple! 



Only other suggestion I might make is you might try swapping out the MK IV preamp module between the "good" old head and one of the other heads in question. 

At least that would eliminate that part as a cause. 



?I got?several Ampex alignment tapes sitting around here. I could mail out one?to you to use as a test tape if you dont have one on hand there. 

That and a waveform monitor?would help you out a lot in diagnosing. 

larry ? 
----- Original Message ----- 
From: "lee williams" <lasvegastvengineer at yahoo.com> 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Sent: Monday, August 1, 2011 5:34:00 PM 
Subject: Re: [QuadList] AVR 3 heads question 


You see the same tearing in demod that you see in the output. 




--- On Mon, 8/1/11, Chill315 at aol.com <Chill315 at aol.com> wrote: 



From: Chill315 at aol.com <Chill315 at aol.com> 
Subject: Re: [QuadList] AVR 3 heads question 
To: quadlist at quadvideotapegroup.com 
Date: Monday, August 1, 2011, 2:13 PM 



Lee 

What does the Demod out look like? 

Chris Hill 


In a message dated 8/1/2011 5:12:28 P.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes: 


Hello Larry, 

Sorry but not the problem, 

The closest thing I can describe the effect is white streaks with analog snow in them trailing out like a comet tail from the trailing edge of anything white in the picture. 

No digital?blocks, Not a head clog. 

Thanks. 

Lee 


--- On Sun, 7/31/11, LARRY <leodham at centurylink.net> wrote: 



From: LARRY <leodham at centurylink.net> 
Subject: Re: [QuadList] AVR 3 heads question 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Date: Sunday, July 31, 2011, 6:58 AM 




Hello Lee, 

I have been following some of the back-and-fourth e-mails on your tape playback trouble. 
Here is my two cents worth: 

?I have experienced this problem before. 
The video is tearing in what looks to be square blocks? right?? 
I have encountered that very same effect here on a VR-1200b. It was caused here by the playback equalization. A good way to verify if this is the problem is to go to manual equalization, and turn down(reduce) the EQ one channel at a time. If you see an improvement, then stop the machine, unthread the tape, and look with a magnifier at the drum surface behind each head tip(trailing surface). You may find a small build-up of black-looking stuff behind one, or all, of the head tips?on the drum edge surface itself. 
This build-up increases the diameter of the head drum just enough to decrease tip penetration at the head. 
Usual cleaning of the tips will not remove this buildup. Alcohol and a fingernail will. CAREFULLY!! 

?OK, hope this helps, 
larry 
----- Original Message ----- 
From: "lee williams" <lasvegastvengineer at yahoo.com> 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Sent: Sunday, July 31, 2011 12:24:33 AM 
Subject: Re: [QuadList] AVR 3 heads question 


Hello, 
Answers below questions. 



--- On Sat, 7/30/11, Chill315 at aol.com <Chill315 at aol.com> wrote: 



From: Chill315 at aol.com <Chill315 at aol.com> 
Subject: Re: [QuadList] AVR 3 heads question 
To: quadlist at quadvideotapegroup.com 
Date: Saturday, July 30, 2011, 9:38 AM 



Lee 

How does the RF envelope look on the scope? 
No Scope - I can tell I have plenty of RF with my tracking adjustment. 


How is Vertical lining up with house? 
AVR3 is on internal generator. No difference if I hook up a black source to the machines. 


Do you have an alignment tape?? If so, how does it play and where is the tracking knob? 
Alignment and known good tapes play fine. 
Client has several thousand tapes made in the early 80's (probably on a VR2000) 

Are you using manual or auto tracking? 
Manual normally.? No difference in auto. 

30 lines of black may be that you are one or two head passes off in the vertical realm.? The tearing may be due to the fact that you can not get the head centered on the track perfectly.? 

The head assemblies are made so good that they meet SMPTE specifications with in a few hairs.? This is to create interchangeability between machines.? 

I would not touch the heads in any way as you will destroy the interchange.? It is a critical factor.? If you saw the recent slide show on here, you see the great deal of care taken to make a head. 

Now the tape you have may have been done in a non standard method.? That is why all the questions.? 

I always assume that the tape was poorly made.? Many operations did not do best practices and thus there is a lot of poorly made tapes.? 

I know it's the tape that is off. (several thousand of them) 
Now how do I get them transferred short of sending in the weak head to the rebuilder and have him duplicate the deviation were the head is off of true? 

Chris Hill 
WA8 IGN 


In a message dated 7/30/2011 11:56:38 A.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes: 


Hay all, 
Have a good one here ??? 

AVR3 Mark XV heads. 

Have some 2" tape that when you try to pull it through the machine will will give you something that looks like video tearing in the whites and slow horizontal jitter. 

If I slam the tracking all the way down, I get a very clean picture, but about 30 lines of black overhead on the screen. 

I see this on all my new(er) heads I get from both Aheadtek and VideoMagnetics. 

I have 1 very warn out head (supplier unknown) that will lock to these tapes 

Has anybody seen this before and is there a way this heads set up can be duplicated? 

Thanks 

Lee 



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From leodham at centurylink.net  Mon Aug  1 16:58:51 2011
From: leodham at centurylink.net (LARRY)
Date: Mon, 1 Aug 2011 17:58:51 -0400 (EDT)
Subject: [QuadList] AVR 3 heads question
In-Reply-To: <1312234440.48160.YahooMailClassic@web37902.mail.mud.yahoo.com>
Message-ID: <1684723231.1630155.1312235931657.JavaMail.root@md38.embarq.synacor.com>



Lee, 

A couple other things that come to mind that can cause that sort of problem you describe, 1. dc voltage leaking into the FM discriminator(detector) on the Demod board due to a leaky blocking capacitor. 

If you got a spare board, try swapping that one. 

2. The head switcher board(s) could need slight adjusting. That will cause streaking, dropuots, random white dots in the video,velocity/phase error?of varying degrees depending on how far out it is. 

Swapping-out this board(s) may or may not work without re-adjusting. 

larry 


----- Original Message ----- 
From: "lee williams" <lasvegastvengineer at yahoo.com> 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Sent: Monday, August 1, 2011 5:34:00 PM 
Subject: Re: [QuadList] AVR 3 heads question 


You see the same tearing in demod that you see in the output. 




--- On Mon, 8/1/11, Chill315 at aol.com <Chill315 at aol.com> wrote: 



From: Chill315 at aol.com <Chill315 at aol.com> 
Subject: Re: [QuadList] AVR 3 heads question 
To: quadlist at quadvideotapegroup.com 
Date: Monday, August 1, 2011, 2:13 PM 



Lee 

What does the Demod out look like? 

Chris Hill 


In a message dated 8/1/2011 5:12:28 P.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes: 


Hello Larry, 

Sorry but not the problem, 

The closest thing I can describe the effect is white streaks with analog snow in them trailing out like a comet tail from the trailing edge of anything white in the picture. 

No digital?blocks, Not a head clog. 

Thanks. 

Lee 


--- On Sun, 7/31/11, LARRY <leodham at centurylink.net> wrote: 



From: LARRY <leodham at centurylink.net> 
Subject: Re: [QuadList] AVR 3 heads question 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Date: Sunday, July 31, 2011, 6:58 AM 




Hello Lee, 

I have been following some of the back-and-fourth e-mails on your tape playback trouble. 
Here is my two cents worth: 

?I have experienced this problem before. 
The video is tearing in what looks to be square blocks? right?? 
I have encountered that very same effect here on a VR-1200b. It was caused here by the playback equalization. A good way to verify if this is the problem is to go to manual equalization, and turn down(reduce) the EQ one channel at a time. If you see an improvement, then stop the machine, unthread the tape, and look with a magnifier at the drum surface behind each head tip(trailing surface). You may find a small build-up of black-looking stuff behind one, or all, of the head tips?on the drum edge surface itself. 
This build-up increases the diameter of the head drum just enough to decrease tip penetration at the head. 
Usual cleaning of the tips will not remove this buildup. Alcohol and a fingernail will. CAREFULLY!! 

?OK, hope this helps, 
larry 
----- Original Message ----- 
From: "lee williams" <lasvegastvengineer at yahoo.com> 
To: "Quad List" <quadlist at quadvideotapegroup.com> 
Sent: Sunday, July 31, 2011 12:24:33 AM 
Subject: Re: [QuadList] AVR 3 heads question 


Hello, 
Answers below questions. 



--- On Sat, 7/30/11, Chill315 at aol.com <Chill315 at aol.com> wrote: 



From: Chill315 at aol.com <Chill315 at aol.com> 
Subject: Re: [QuadList] AVR 3 heads question 
To: quadlist at quadvideotapegroup.com 
Date: Saturday, July 30, 2011, 9:38 AM 



Lee 

How does the RF envelope look on the scope? 
No Scope - I can tell I have plenty of RF with my tracking adjustment. 


How is Vertical lining up with house? 
AVR3 is on internal generator. No difference if I hook up a black source to the machines. 


Do you have an alignment tape?? If so, how does it play and where is the tracking knob? 
Alignment and known good tapes play fine. 
Client has several thousand tapes made in the early 80's (probably on a VR2000) 

Are you using manual or auto tracking? 
Manual normally.? No difference in auto. 

30 lines of black may be that you are one or two head passes off in the vertical realm.? The tearing may be due to the fact that you can not get the head centered on the track perfectly.? 

The head assemblies are made so good that they meet SMPTE specifications with in a few hairs.? This is to create interchangeability between machines.? 

I would not touch the heads in any way as you will destroy the interchange.? It is a critical factor.? If you saw the recent slide show on here, you see the great deal of care taken to make a head. 

Now the tape you have may have been done in a non standard method.? That is why all the questions.? 

I always assume that the tape was poorly made.? Many operations did not do best practices and thus there is a lot of poorly made tapes.? 

I know it's the tape that is off. (several thousand of them) 
Now how do I get them transferred short of sending in the weak head to the rebuilder and have him duplicate the deviation were the head is off of true? 

Chris Hill 
WA8 IGN 


In a message dated 7/30/2011 11:56:38 A.M. Eastern Daylight Time, lasvegastvengineer at yahoo.com writes: 


Hay all, 
Have a good one here ??? 

AVR3 Mark XV heads. 

Have some 2" tape that when you try to pull it through the machine will will give you something that looks like video tearing in the whites and slow horizontal jitter. 

If I slam the tracking all the way down, I get a very clean picture, but about 30 lines of black overhead on the screen. 

I see this on all my new(er) heads I get from both Aheadtek and VideoMagnetics. 

I have 1 very warn out head (supplier unknown) that will lock to these tapes 

Has anybody seen this before and is there a way this heads set up can be duplicated? 

Thanks 

Lee 



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