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Not sure why you would suggest a brightener as an option, if it appeared to you that you could just get away with turning up the blue drive a bit. Normally the drives are never going to be set exactly the same anyway.
To me a brightener is more of a last case option if several or all the guns are weak and you can't get a clean grey scale setup or you have other picture problems from the weak guns. You should first do that setup, then see how far you had to crank everything up to get it (blue drive & overall bias setting). Then there's that old switcharoo trick with the video drive controls' wiring but that's only if you can't get good grey scale tracking as the set and tube are now. Can you do the grey scale setup and post the results?
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