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I have never seen a Hickok CRT tester but if its anything like the tube testers Hickok built, its among the best. Make sure you let the tester on it for at least a few hours and see how emission readings climb. Sometime this is all you need to do without using clean-restore-rejuvenate functions.
I can speculate that original CRT may have lasted 5 years and that was not unusual based on some anecdotes shared here. A Zenith or RCA CRT of that era usually lasted over 10 years. That date code is possibly a few weeks before the earliest date of replacement but it could have been a few years later, too. A hi-Lite tube is all-new, not rebuilt like the Colorama series.
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"When resistors increase in value, they're worthless"
-Dave G
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