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The one in my 51' Zenith was STONE dead until baked at elevated heater voltage for a couple of hours....Then it slowly came to weak usable (with a brightener) life.
ALWAYS run the heater at mild over voltage for at least 15 minutes BEFORE you do or consider a rejuvination.....Else you risk burning the last of the cathode material off.....I hope you did not ruin your tube doing the rejuvination first.
I say if they are only usable with a brightener, then it is a hell of a lot better than a stone dead tube.
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