Monitor deflection magnets; what to do when one falls out & breaks?

From: Paul Koning <pkoning_at_equallogic.com>
Date: Thu Jul 15 11:46:54 2004

>>>>> "Brad" == Brad Parker <brad_at_heeltoe.com> writes:

 Brad> Paul Koning wrote:
>> It's probably not a magnet, but rather a ferrite core. You'd know
>> the difference putting the pieces together -- if you feel no
>> attraction or repulsion, it's not a permanent magnet.

 Brad> Interesting. The pieces do attract.

 Brad> Are ferrite cores magnetic?

Nope.

 Brad> (I would think a ferrite core would have wires wrapped around
 Brad> it)

Not necessarily. I've seen deflection yokes that had ferrite in them,
but not with the wire around them.

 Brad> These magnets are not connected to the wired internal yoke
 Brad> assembly - they are glued to a "collar" which is close to the
 Brad> back of the tube. The collar is round but the magnets are
 Brad> glued to make a square - I assume this helps make the image
 Brad> square. (or not :-)

Probably not... Anyway, sounds like it might be a focusing magnet.

 Brad> The magnets on the two sides are symmetric as are the top and
 Brad> bottom. Both top and sides have two "tube magnets" but ared
 Brad> spaced slightly differently. The sides have two magnets side
 Brad> by side with no gap. The top and bottom have two magnets side
 Brad> by side with a a 1/4" gap.

 Brad> I can see where the glue was holding the magnet. That's where
 Brad> I put it back.

 Brad> I assume the poles should be aligned, i.e. the poles of the two
 Brad> magnets should be the same, producing a larger overall field (I
 Brad> presume)

If the bore in the magnet is cylindrical, it would fit on the neck of
the tube two ways. Only one of those is right (and I'm not sure which
one that would be). So you might try taking it off and turning it 180
degrees to see if that improves matters.

Are you sure that the fragments are held together with no air gap? If
not you might try thin superglue to glue the pieces to fix that.

    paul
Received on Thu Jul 15 2004 - 11:46:54 BST