When is alignment required?

[old_tv_nut]

Originally Posted by ChrisW6ATV

Yes, high-resolution B&W sets will show the chroma as various patterns of dots, and the solution is to use the Y signal from an S-video or component-video output of a DVD player or digital-TV tuner into a modulator. Once color TV hit in the mid-50s, I think they just started making all the sets with lower bandwidth in general, but I may be wrong. A notch filter on 3.58 MHz would have helped, but I don't know if they were used in B&W sets later or not.

There never was a specific dot filter in a B&W chassis - unnecessary expense.
Also, manufacturers learned that a picture with less than full resolution, but reduced noise, was preferable to many people. The classic flat-topped response was replaced by a "haystack" IF curve, which attenuated high frequency noise and added mid-frequency peaking to restore apparent picture sharpness.