[QuadList] AVR3 Video Head Degausing

Wed Jul 25 15:00:16 CDT 2012

I understand and I should have provided more detail. I used a work tape, not a client or master tape, and it was on AVR-1's so I used auto cue/time code marks and only went for ten seconds of tape. The AVR-1 would do ten or twenty passes very quickly.

Sent from my iPad

On 2012-07-25, at 1:13 PM, "Chill315 at aol.com<mailto:Chill315 at aol.com>" <Chill315 at aol.com<mailto:Chill315 at aol.com>> wrote:

Celebrating four years of Quad Conversations, July 25, 2012

_______________________________________________
Wayne

I could not afford to even do the additional passes.  The client in  the
post production business will not accept any damage to their tape.  And  now,
it is even more critical in the transfer business.  I can see where  this
would apply in the broadcast station where tape gets reused a lot.  We  would
have to eat the time and tape costs to do any work over that was damaged  in
this method.  So our standards were different than many other  places.

Chris Hill

In a message dated 7/25/2012 2:26:15 P.M. Eastern Daylight Time,
wayne.watson at sait.ca<mailto:wayne.watson at sait.ca> writes:

Celebrating four years of Quad Conversations, July 25,  2012

_______________________________________________

I agree Chris and that is exactly what it looks like. The dots would
become worse (intensify) over many passes. To isolate the magnetized area I
would put  a layer or two of scotch tape on, say a post, and then do 10  or 20
passes and look at the dots again. Of course clean the path well after  this.

Wayne Watson

Sent from my iPad

On 2012-07-25, at 11:55 AM, "_chill315 at aol.com<mailto:chill315 at aol.com>_ (mailto:chill315 at aol.com) "
<_chill315 at aol.com<mailto:chill315 at aol.com>_ (mailto:chill315 at aol.com) > wrote:

Celebrating four years of Quad Conversations, July 25,  2012

_______________________________________________

IMHO the rotary head is not the problem.  The biggest thing  that I found
needing degaussing was the rest of the tape path.  The  magnetized areas
would show up as fine dots on a diagonal line.  This  was caused by erasing a
part of the tape.  But it would only be a fine  amount and appear to be a
scratch.

Degaussing the path and it would  disappear.  The problem was that the
demagnetization had taken place  and the tape is now degraded.

We did the  tape path about every 25 hours of head  use.

Chris  Hill

On Jul 25, 2012, at 1:32 PM, lee  williams <_lasvegastvengineer at yahoo.com<mailto:lasvegastvengineer at yahoo.com>_
(mailto:lasvegastvengineer at yahoo.com) >  wrote:

Celebrating four years of Quad  Conversations, July 25, 2012

_______________________________________________

Does anybody have any experience on the  benefits of degaussing the video
heads on a Mark IV  head?

Came across the old maintenance manual for  the AVR3 and Ampex recommended
that it be done every 100 hours. (As well  as the entire tape path).

Is this overkill ?

Thanks

Lee

_______________________________________________

Please trim posts to relevant info when  replying.

Change subject to reflect thread direction.  Thanks.

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IMHO the rotary head is not the problem.  The biggest thing that I  found
needing degaussing was the rest of the tape path.  The magnetized  areas
would show up as fine dots on a diagonal line.  This was caused  by erasing a
part of the tape.  But it would only be a fine amount and  appear to be a
scratch.

Degaussing the path and it would disappear.  The problem was that  the
demagnetization had taken place and the tape is now degraded.

We did the tape path about every 25 hours of head use.

Chris  Hill

On Jul 25, 2012, at 1:32 PM, lee williams <_lasvegastvengineer at yahoo.com<mailto:lasvegastvengineer at yahoo.com>_
(mailto:lasvegastvengineer at yahoo.com) >  wrote:

Celebrating four years of Quad Conversations, July 25,  2012

_______________________________________________

Does anybody have any experience on the benefits  of degaussing  the video
heads on a Mark IV head?

Came across the old maintenance manual for the AVR3  and Ampex recommended
that it be done every 100 hours. (As well as the  entire tape path).

Is this overkill ?

Thanks
Lee

_______________________________________________
Please  trim posts to relevant info when  replying.

Change subject to reflect  thread direction.  Thanks.
_______________________________________________

Send  QuadList list posts to _QuadList at quadvideotapegroup.com<mailto:QuadList at quadvideotapegroup.com>_
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_______________________________________________
Please  trim posts to relevant info when  replying.

Change subject to reflect thread  direction.  Thanks.
_______________________________________________

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_______________________________________________
Please  trim posts to relevant info when replying.

Change subject to reflect  thread direction.  Thanks.
_______________________________________________

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oup.com<http://oup.com>
Wayne

I could not afford to even do the additional passes.  The client in the post production business will not accept any damage to their tape.  And now, it is even more critical in the transfer business.  I can see where this would apply in the broadcast station where tape gets reused a lot.  We would have to eat the time and tape costs to do any work over that was damaged in this method.  So our standards were different than many other places.

Chris Hill

In a message dated 7/25/2012 2:26:15 P.M. Eastern Daylight Time, wayne.watson at sait.ca<mailto:wayne.watson at sait.ca> writes:
Celebrating four years of Quad Conversations, July 25, 2012

_______________________________________________

I agree Chris and that is exactly what it looks like. The dots would become worse (intensify) over many passes. To isolate the magnetized area I would put  a layer or two of scotch tape on, say a post, and then do 10 or 20 passes and look at the dots again. Of course clean the path well after this.

Wayne Watson

Sent from my iPad

On 2012-07-25, at 11:55 AM, "chill315 at aol.com<mailto:chill315 at aol.com>" <chill315 at aol.com<mailto:chill315 at aol.com>> wrote:

Celebrating four years of Quad Conversations, July 25, 2012

_______________________________________________
IMHO the rotary head is not the problem.  The biggest thing that I found needing degaussing was the rest of the tape path.  The magnetized areas would show up as fine dots on a diagonal line.  This was caused by erasing a part of the tape.  But it would only be a fine amount and appear to be a scratch.

Degaussing the path and it would disappear.  The problem was that the demagnetization had taken place and the tape is now degraded.

We did the tape path about every 25 hours of head use.

Chris Hill

On Jul 25, 2012, at 1:32 PM, lee williams <lasvegastvengineer at yahoo.com<mailto:lasvegastvengineer at yahoo.com>> wrote:

Celebrating four years of Quad Conversations, July 25, 2012

_______________________________________________
Does anybody have any experience on the benefits of degaussing the video heads on a Mark IV head?

Came across the old maintenance manual for the AVR3 and Ampex recommended that it be done every 100 hours. (As well as the entire tape path).

Is this overkill ?

Thanks
Lee

_______________________________________________
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
_______________________________________________

Send QuadList list posts to QuadList at quadvideotapegroup.com<mailto:QuadList at quadvideotapegroup.com>
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IMHO the rotary head is not the problem.  The biggest thing that I found needing degaussing was the rest of the tape path.  The magnetized areas would show up as fine dots on a diagonal line.  This was caused by erasing a part of the tape.  But it would only be a fine amount and appear to be a scratch.

Degaussing the path and it would disappear.  The problem was that the demagnetization had taken place and the tape is now degraded.

We did the tape path about every 25 hours of head use.

Chris Hill

On Jul 25, 2012, at 1:32 PM, lee williams <lasvegastvengineer at yahoo.com<mailto:lasvegastvengineer at yahoo.com>> wrote:

Celebrating four years of Quad Conversations, July 25, 2012

_______________________________________________
Does anybody have any experience on the benefits of degaussing the video heads on a Mark IV head?

Came across the old maintenance manual for the AVR3 and Ampex recommended that it be done every 100 hours. (As well as the entire tape path).

Is this overkill ?

Thanks
Lee

_______________________________________________
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
_______________________________________________

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_______________________________________________
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
_______________________________________________

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_______________________________________________
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
_______________________________________________

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_______________________________________________
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
_______________________________________________

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