Sorry to hear your CRT is weak, I know it's a big let down. Did you by chance try testing with a slightly higher filament voltage- say 7-8 volts? If the emission comes up at all, that would give you some indication if the tester is working correctly.
Something will show up eventually, but it can take a lot of waiting. Keep your eye on the local Craigslist, even for what looks like a junker set. You never know when a good CRT is lurking in a ugly old cabinet.
In the mean time try to find another restorer in your area and verify the condition of your CRT tester. Best of luck.
Kevin
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