Old CRT booster just lost it's job today!

[mr_fixer]

Hello All! last week i got a haul of CRT testers/rejuvenators from a old tv service shop. today i tried using one for the first time . the tv is a 59/60 admiral B&W 23 inch set. It had a booster on it for years before i got it and barely a viewable picture. I used a Sencore cr70 and the tube didn't even move the needle. I followed the instructions for the auto restore mode and now the emissions read up to the letter "d" in the word good and are steady when the life test button is pressed. Yay! why did i wait so many years to get a tube rejuvenator?
Logan