[Coco] Degauss an old CM-8

[tim franklinlabs.com]

   The magnet approach should be a last, if at all, option. There's a
   metal filter mesh called a shadow mask behind the glass that if the
   magnetic field is too strong, this mesh will warp. This cannot be
   repaired and the tube is ruined.

   [1]http://en.wikipedia.org/wiki/Shadow_mask

     On January 23, 2015 at 8:56 AM Allen Huffman <alsplace at pobox.com>
     wrote:
     > On Jan 23, 2015, at 4:36 AM, Arthur Flexser <flexser at fiu.edu>
     wrote:
     >
     > You might first try something simpler. Occasionally, just turning
     the
     > monitor or TV on enough times is enough for degaussing, since many
     have
     > some degaussing built in to the starting up circuitry. It might
     take 20 or
     > more times to have any noticeable effect, but there's not much to
     lose by
     > trying.
     I wondered about that, but assumed the CM-8 was too old for that. I
     know my big industrial Sony Trinitron monitor (with touch screen,
     amplifier for speakers, etc.) has a degaussing button on it :)
     I guess as long as the monitor doesn't die from the power cycles,
     it's worth a shot.
     -- A
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References

   1. http://en.wikipedia.org/wiki/Shadow_mask