[QuadList] AVR3 Video Head Degausing

[Chill315 at aol.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 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











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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 
 
 





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