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Not all early CRTs were dim. Part of the problem is that many of the ones we see are now old and well down on their original performance. Using the Emiscope 6/6 as an example. This is a 12" magnetic deflection, electrostatic focus CRT from 1936. It runs at 5kV EHT. The ones I've seen range from dim to very dim to totally unusable. The one that I had rebuilt in 1986 gave an astonishingly bright and sharp picture. Perhaps not bright by modern standards but a lot better than any originals.
Let's hope that Ebeam can rebuild these CRTs successfully so that we can enjoy these sets as they were intended.
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