William Sommerwerck wrote:

Pictures don't just get bigger. The only way for that to happen
is as Phil said, something happens to the HV, but that only applies
to sets with separate HV and horiz. sweep.

I have trouble imagining a set with separate horizontal sweep and HV --
especially a set with a reasonably sized CRT.

The "flyback" HV circuitry can certainly lose its regulation, while the sweep
continues to work correctly.


CRT VGA monitors.