[QuadList] AVR 3 heads question
Videomagnetics
vmi at csprings.com
Tue Aug 2 11:45:38 CDT 2011
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
To: Quad List
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
To: quadlist at 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 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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