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Yes, I have done this on some CTC-68's and CTC-92's. I wound 3 turns (appx.) of wire around the flyback core to provide the boost voltage. Put this voltage to one side of a DPDT switch, put the original filament supply to the other side of the switch, ran the switch output to the CRT. I mounted the switch through a hole already provided on the TV back. I then flipped the switch to the boost position for several minutes, then filpped it to "normal" filament voltage. I did this for several days. The CRT was much better. After a month or so, it got slightly dim again, so I used the boost position and then put it back to normal and it was rejuvenated again. The CRT was not perfect after using the boost setup but it was alot better. This flyback setup should not be used on tube sets as it will draw too much extra current.
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