[QuadList] AVR3 Video Head Degausing

[Wayne Watson]

I agree Chris and that is exactly what it looks like. The dots would 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

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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

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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



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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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