12" EMIscope 3/31 rejuvenation?

[Sandy G]

Weren't a LOT of those early CRTs pretty dim, anyway ?

[Zenith26kc20]

I would use a Beltron if you want to try a rejuv. But, as mentioned earlier, very early tubes were not stellar performers. Please don't think I knock them at all, but my 7 inch motorola electrostatic pictures are dim compared to some of the late production 5 and 7 inch solid state black and white TV's. Also, I would test it before whacking it. That has got to be a very rare tube!

[ppppenguin]

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.