21zp4a crt sub

[bandersen]

Setting the HV higher will likely cause the image to shrink. It's harder to deflect a more energetic electron.

Now the flyback also drives the horizontal yoke winding so it's not quite so simple. Generally, the more energy you dump into the flyback, the more HV and more deflection so they track.

Really it depends on the design and component matching. There's usually a sweet spot when you get the lowest cathode current, most HV and full width. That's why there are so many adjustments - hor. drive, width and linearity all need to be set properly to get optimal results. That's a bit of a black art.