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I'd suggest getting a later model B&K (like a 467, 470, 480, or 490) CRT tester. These usually do a pretty good job of bringing back a weak tube. Stay away from models below 467 unless you want to fry your CRT. These can often be bought on epay for a reasonable price since the popularity of the CRT is fading.
I've ran into TV's (both B&W and color) with a brightner hanging off the tube. Sometimes, the tube would already be worn to the point where rejuvenation would not work. Other times, I've removed the brightner and they rejuvenated just fine. I've seen a few B&W tubes with open filaments as a result of a brightner. An old TV repair friend told me that he once had a B&W set come in with 3 brightners hanging off the tube. He added that the filament was burned out.
If a decent CRT tester is not possible, go ahead with the brightner. I think you'll have better results with the CRT tester.
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