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That older CRT tester is an "atomic blast" model and wouldn't be the best one for the job, even if you had an adapter. I'd highly recommend getting a newer B&K 467, 470, 480, 490, or a Sencore CR70. These have a more advanced rejuvenate function and will come closer to giving you some more life out of that tube, instead of blowing it up. On the B&K models, you'll need adapter #CR23 to test that tube.
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