[time-nuts] [OT] degausing
jimlux at earthlink.net
Fri Apr 16 04:35:36 UTC 2010
Chuck Harris wrote:
> David Martindale wrote:
>> However, I don't see how the earth's tilted field prevents a CRT from
>> used in both hemispheres. I can see how it might need to be realigned,
>> since it uses permanent magnets on the yoke and their field will be
>> influenced by the earth's local field. But a different model for the
>> southern hemisphere?
> It has to be made somewhere, and if that somewhere has a magnetic field
> that points in the opposite direction, of where the CRT is going to be
> used, it is going to be aligned wrong. The answer can be as simple as
> readjusting the magnets on the CRT.
> The real solution is to put the CRT in a magnetic shield.
And, of course Trinitron tubes, since they have only one gun, no
shadowmask, and synchronize by looking for the backscatter from the
face, are immune to such convergence effects.
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