A bit of a minor update but it is good news in regards to the CRT. 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 tested the Ford Philco tv's picture tube at the normal 6.3 volts and all three color gun's emissions were GOOD! Also no shorts in the CRT were detected by the tester which rules out the CRT being the cause of the arcing I had been seeing in the HV cup area.
So it appears that I have a picture tube that is in great shape and with plenty of life left.
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