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The 30" tube is big, awkward and scary to handle, but not all that heavy. The tube was stored above my head on a shelf in the garage. The scary part was standing atop a 2-step footladder, embracing the bell of the tube, lifting it to point the neck of the tube past my head and over one sholder, and wobbling back down the 2 steps. Whew!
If you look at the photo of the CRT behind the DuMont, you can see the cheaper version chassis. Very conventional.
As for the life expectancy of the 30BP4, I just don't have any data on the subject. I would speculate that not a lot of sets were made using the 30BP4. Seems like DuMont only produced that tube for 2 year(?). Maybe longer for renewal reasons. Or they may have offered rebuild services. The urban legend is that all the metal cone CRTs had a higher failure rate than the all glass CRTs. Seems probable, but I have not seen any reports or articles on the subject.
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John Folsom
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