When did CRT technology advance to no convergence required?

[Phototone]

I was curious as to when Television CRT technology advanced to where there was no need for delicate and time-consuming convergence in the home? Was it the in-line guns? I have an original GE portacolor that just has the convergence magnets on the tube. I am assuming that was the beginning of the end of the myriad array of convergence pots and coils.