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If you're tube already has a brightner on it, there is not much more you can do other than to try rejuvenation. Usually a weak CRT will benefit from adding a brightner after rejuvenation.
CRT filaments are about 100% over-rated so they can safely run at 12v. however this does shrten their life, and if you go beyond 12, they open in a rapid fashion.
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Jordan
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