Yup this one probably uses the Thompson tube. They were no problem.
Zenith built the most reliable CRT's from the mid 60's to about 1993
then they became the worst. Gold Star was getting control of Zenith
& thats probably related.
We sold quite a few of these sets. Most went to old folk. Also sold a
lot to immigrants from the islands like Haiti etc. Nobody stocked them
in the Boston area but us. Mom & Pop stores were out of sales &
big box couldnt be bothered.
73 Zeno
LFOD !