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Old 29th August 2008, 04:35 PM   #11
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In case of CRT you have to optimize the whole system: electrical, magnetical, and geometrical.

I.e. yoiur oscillator drives coils that deflect the ray that makes a spot on the surface that is not ideally spherical.
The Devil is not so terrible as his math model is!
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Old 29th August 2008, 05:01 PM   #12
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Sorry to bring doom and gloom but you will never do it. The deflection currents for a CRT are not linear but are modified to allow for correction of geometry. At the most basic level you need to introduce N-S and E-W correction as well as pincushion correction. All done by modifying the line and field current in the deflection yoke away from the ideal sawtooth.
I would suggest you read up on television receiver theory.
You image "enlarges" on bright scenes because the EHT drops due to poor regulation. As the EHT falls the electron beam becomes easier to deflect so the picture goes bigger.
Try something less ambitious
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