[QuadList] AVR 3 heads question
Guy Spiller
quadruplex at verizon.net
Mon Aug 1 16:13:18 CDT 2011
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
>
>
>
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--
Guy Spiller
email: quadruplex at verizon.net
phone: (804) 379-2050
website: www.GuySpiller.com
Midlothian, VA
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