General CRT Discussion

Fun fact: If you have select models of Toshiba, they have something called VM which stands for Velocity Modulation, it is also known as VSM: Velocity Scan Modulation (which is what it's called on some Sony's) It's primarily a 2000's flat CRT thing rather than in older curved sets.

This fun little feature basically causes black lines to get thicker and white lines to get thinner. This can result in a not so uniform or clean image when using component inputs.
It is primarily intended purpose was to help mask and hide some of the artifacts and messiness of composite input signals.

Some sets that have VM cannot have it disabled, but some sets can have it disabled.

If a set can have it disabled, it's usually by way of just unplugging a single cable that connects the neck of the yolk to the neckboard. EZ PZ.

However, some sets don't do it simply with a cable like that, but can still have it disabled by changing certain settings in the OSD such as turning on Movie mode, and disabling any sort of denoiser and such.

For the rest, it can't be disabled unfortunately.

Here's a side by side comparison of what it looks like with it on and off.