[QuadList] Visible effects of magnetized tape path elements (was AVR3 Video Head Degausing)

[Ted Langdell]

This is a very useful thread for folks who may not have seen this type of damage.

Does anyone have screen captures that illustrate what Wayne and Chris are writing about?

Please post to the list if you can.  

Under 1MB photo + text will go directly to the list.  Larger files will make a stop for review. (That's to keep HUGE files from causing problems with recipients' in-boxes)

Thanks,

Ted

Ted Langdell
Secretary

On Jul 25, 2012, at 11:25 AM, Wayne Watson wrote:

> 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" <chill315 at aol.com> wrote:
> 
>> 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

Ted

Ted Langdell
Secretary

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