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A friend has a 31" digital system 3 in a console cabinet. I think it's an '88 or '89 model. It has all sorts of jacks on it and would receive teletext information. He said he gave $1600 for it and it was a store display. Once, it went dead and all it needed was an AC fuse (lucky me). Later, the vertical started to stretch at the top and the tube started going weak. I rejuved the tube but left the vertical alone because he said it wasn't bothering him. The tube quickly started falling back down again. That set was very packed inside and I think the main module was a 9-700. Since the board was shielded and hard to get to; that board was very hard to service. That set has been serving as a stand for another plain 27" TV for the past 6 or 7 years.
I once had a little newer 27" digital system 3 with the Bose audio system in a table model case. The CRT was 100% DEAD and the set had power supply problems. Due to the bad tube; I junked it.
Even though these sets are a pain to work on; they had some nice features for their day and made very nice pictures when the CRT is good.
I don't know if there was a better tube made for those sets. Around '94, someone gave me a '92 ordinary 27" Zenith that used an A68ACT00X tube. I replaced the tube with a rebuilt OptaChrome (IIRC) brand and it only lasted a little over a year before it shorted and took the power supply with it. Every now and then, I'd salvage a better Zenith tube out of a junked '80's console. That was about the only way I could fix a '90's Zenith with a bad CRT.
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