i've replaced trinitron tubes, and yes, they do require some alignment (however, purity, and convergence were simplified to the point where it took 1 hour or less compared to the 3 or so hours required before), but not as much as tubes that had the 3 guns arranged in a triangle. "inline" tubes later copied the gun structure of the trinitron, and that simplified the adjustments, but they still required some tweaking after replacement. when i repaired computer monitors, new tubes often came without yokes and alignment rings, so the old yoke and alignment rings had to be transferred to the new tube, and the whole process of tube alignment and convergence had to be done. the convergence electronics and active convergence electromagnets were no longer required (the constant tweaking of the interactive controls on a convergence board could take up to 3 hours because you'd do one pass, but since the controls interacted with each other, you'd do another pass and get it closer, and so on....), , but the ring alignment had to be done and the yoke had to be wedged properly. i had a special crosshatch pattern made of red, green, and blue segments that worked extremely well, because all you had to do was line up the segments in straight lines.