On Mon, May 2, 2016 at 4:47 PM, David Riley via vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Yes, all I meant to say is that to my understanding, it's similarly temporary, > and the effect of a rejuvenator on a CRT tends to revert similarly quickly.
It can be, but, what it's really doing is burning off the outer coating of the cathode, and exposing more emissible material. This can be temporary, depending on tube construction, but it's been my experience that most mono tubes take to it very well and hold up nicely. Some tubes, notably Sony color tubes... don't rejuvinate. Not at all. And some, like 90's era Zenith tubes as used in some arcade monitors - will revert within a week of use. But I've got mono tubes I've zapped that are still fine, years later. Also, when the tube is that dim - you have nothing to lose. Doesn't hurt to try to get a little more use out of it. -Ian