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You really need a tester that is designed for it. The Sencore CR70, which I have, is designed to test both TV CRTS and scope tubes. 7JP4 gets treated as a scope tube. If your tester doesn't do scope tubes, it probably won't test a 7JP4 properly. Sounds like you're going to pay a visit to banderson and his CR70. That should clarify the situation!
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