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RCA's last was the CTC-20 which I think was around 1968, and it was one of the infamous multi 6GH8 chassis series RCA put out that liked to eat that tube.
I for get Zenith's last chassis number, but it was around that time and a decent set.
IIRC Philco kept roundys going until ~1973. in the late 60's they went with a hybrid chassis that had SS IF circuits (and in high end models a tuning eye) those I hear were fairly reliable, and I know were solid performers. Very sharp clear video, and somehow most survivors have perfect convergence (something rarely seen in roundys).
I think Muntz and a couple of others had late roundys, but I know little of them.
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