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In an earlier posting, I stated that the 4014 (with its 19" DVST tube) was the largest DVST display that Tektronix made, to which Paul K. responded: -- 4014 is 19 inches). I'm not sure any more which of the two it I stand corrected. I never saw one of these during the 13 years (1977-1990) that I worked at Tektronix. But, after looking around online, indeed, they exist, and there are a number of them still around, including a beautiful, working example at the local Tektronix museum, VintageTek.org. This is probably the article that Paul referred to: https://vintagetek.org/dvst-graphic-terminals/ Funny, last time I was at the museum (which was probably two+ years ago), I didn't see it...perhaps it's a newer acquisition. Had I seen it, I would have been surprised, since it was always my impression that the 19" tube was the largest. The 25" tube had to have some pretty crazy geometry correction circuitry in the deflection system to correct for the curvature of the tube face in X and Y dimensions, as well as probably some beam power correction to account for the curvature. A pretty amazing accomplishment, for sure. Tektronix had some really amazing CRT engineering folks, as well as fabulous CRT fab facilities back in the day. Thank you, Paul, for pointing out my error. Definitely an example of learning something new every day :-) -Rick