Well it increases the current tails in the horizontal output circuitry so it swings the beam harder. 

But the problem with this, it adds stress to the sweep circuitry so eventually itll take its toll.

But, the LC5XX analogs are very close to the CC, there are a few differences, and they run 640x480 without the transformer mods. 

The one thing that stands out between the two circuits, the LC5XX doesnt have the zener clamp diodes. the CC does.