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I doubt there are many sets out there that are still saleable on the used market that are old enough to need a boosting. I've seen few under 20 year old sets with bad CRTs. Those that I have seen have been way beyond boosting.
I've only done it once, and that was purely to get someone off my back. A guy hounded me for weeks wanting a small 12VDC color set. I didn't have anything decent at the time and he didn't want to pay for anything decent. In the end I gave him the choice of 2 5" sets for the same price. One was beat up, missing it's handle, but the CRT was strong and it had a good picture. The other was intact, but the CRT was weak and the picture was awful (boosting it gained some brightness, but the green gun was still way down). He saw both sets and made his choice. He never complained about the picture, so I can only assume he is red-green color blind.
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