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I have seen three 30BP4s, two were weak but usable, one was completely worn out. But all were still under vacuum. I am not aware of any "design flaw" with the tube. It was a large tube, and hard to achieve a really good quality vacuum, or so the urban legend goes, so the likely fault would be shorter than normal life. But the only "flaw" I see with the tube is that it is too darn big to fit in Hawkeye's oven!
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John Folsom
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