Never tried this, but I wonder if you'd be able to use an "activate" procedure on a tube to stir up a little life in it. Just turn up the filament voltage by 20% while it's on the tester.
If it's gonna hit the trash can anyway, seems like it'd be worth a try.
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"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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