Substituting DSHD for DSDD disks (or DS2D if you prefer)

Joseph Lang joe.lang.0000 at
Sun Oct 25 05:39:26 CDT 2015

This list seems to me to be populated with "build your own" types, so make your own degausser. 
Decades ago I repaired the tape eraser at the TV station I worked at. Once I saw how it was built I built my own. Take a transformer (something about 100 watt or more) pull the laminations out (the hard part) line up all the 'E's put them back. Discard the 'I's. 
It will buzz like mad and get hot in a minute but produce a very strong AC magnetic field. 
Keep it away from your shadow mask color TV!


> On Oct 25, 2015, at 1:01 AM, Chuck Guzis <cclist at> wrote:
> On 10/24/2015 09:06 PM, Eric Christopherson wrote:
>> Fascinating -- I didn't know there were AC and DC magnetic fields.
>> How strong is "very strong", and would the library device I mentioned
>> count toward "an AC erase"? Should I assume that just doing an AC
>> erase would be insufficient?
> The AC unit I use is a VHS tape bulk eraser.  It's pretty strong and has a limited working time--maybe 2-3 minutes before the thermal cutout interrupts.  Let it cool for a few minutes and get back to work.
> How strong a DC erase?  I suppose that one of these magnets could well lift a 100 lbs.  Scary strong.
> --Chuck

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