I'ma move this over here.
From what I understand, most of them are similar to other HDTVs in that by default it would display the LD image in 4:3, and since laserdisc is not anamorphic that would mean the widescreen image is in the middle of the screen. However, like most HDTVs you do have a zoom function to make it fit properly, and those CRTs should do a better job than a current LCD/Plasma would. That said, I have no personal experience, I stuck with the SD Wega for vidja games.

