[QuadList] AVR 3 heads question

Tue Aug 2 12:41:21 CDT 2011

Tony has a good suggestion.  Everyone is assuming that it is a machine  or 
head issue.  I think there is a tape issue that the AVR-3 is not able to  
correct .  

Do you have access to any other machine that you could try the tape?   I 
think you need to start thinking about this from another side.  When you  say 
that the De mod out has problems, I would consider other  possibilities.  

Does the label say High Band?

If not, how about Low Band Color (LBC)?

How does the sync level to video look at the De Mod out?

If it is not 100 over 40, that is an indication that the tape may not be  
high band.

How about taking a picture of the waveform and picture at De Mod out and  
posting it?

Or even a video showing the problems.

That will give us an idea of what is going on.

Chris Hill
WA8IGN

In a message dated 8/2/2011 12:46:06 P.M. Eastern Daylight Time,  
vmi at csprings.com writes:

Lee,
We should be able to help you out. If you could send us a couple  of the 
tapes in question and the head block we can see what we can do to  adjust the 
head block to match the recording on the tape.   

Thanks   Tony

----- Original Message ----- 
From:  _lee williams_ (mailto:lasvegastvengineer at yahoo.com)  
To: _Quad List_ (mailto:quadlist at quadvideotapegroup.com)  
Sent: Tuesday, August 02, 2011 10:01  AM
Subject: Re: [QuadList] AVR 3 heads  question

Hello Tony, 
Please review the original question.  

All NEW heads ( have gone through 4 in the last 2 years) will  not play the 
old tape stock. 
Only 1 very old head (that is now  wearing out) will make a clean picture. 

I know ( guess) the  stock was not recorded properly, but what ever is off 
on the  recordings is constant. 

Is there a way to reproduce what ever  is tweaked on that odd ball head 
because my client has a couple of  thousand tapes that this head was the only 
thing that would play them?  

Thanks 
Lee 

--- On Tue, 8/2/11,  Videomagnetics  <vmi at csprings.com> wrote:

From:  Videomagnetics <vmi at csprings.com>
Subject: Re: [QuadList]  AVR 3 heads question
To: "Quad List"  <quadlist at quadvideotapegroup.com>
Date: Tuesday, August 2,  2011, 8:35 AM

Lee,
This could be a rotary transformer problem on the head.

Tony

----- Original Message ----- 
From:  _Chill315 at aol.com_ (mip://074e78d8/mc/compose?to=Chill315@aol.com)  
To: _quadlist at quadvideotapegroup.com_ 
(mip://074e78d8/mc/compose?to=quadlist@quadvideotapegroup.com)   
Sent: Monday, August 01, 2011  3:13 PM
Subject: Re: [QuadList] AVR 3  heads question

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_ 
(mip://074e78d8/mc/compose?to=lasvegastvengineer@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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