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Minor update. I recently acquired my first CRT tester. It is a Sencore CR 161. From what I have heard online, Sencore is a trustworthy brand. After reading the instructions and manual, I quickly learned how to use the tester. I started using it to test all the CRTs in the tv's I am currently working on including the Zenith tv.
Unfortunately but not surprisingly, the 25GP22 picture tube in the zenith is VERY weak. All three color guns were in the "bad range" at standard 6.3 volts. At 7.3 volts which would simulate a tube brightener increasing the voltage, the green gun went to the weak zone from bad, but red and blue were still bad albeit somewhat improved emissions. The only good news is that there were no shorts.
At this point it is likely a replacement of the picture tube will be necessary. However, I suppose I have nothing to lose at this point by trying to rejuvenate it. I have heard that sometimes CRTs need time to "Wake up" if they have been unused for decades, but not sure how true that is or how much time is really needed to wait.
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