On May 2, 2016, at 4:55 PM, Ian Primus via vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
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.
Hm, worth a shot, anyway. I've always been puzzled about the reversion mechanism; it doesn't make a lot of sense from a chemical or physical standpoint unless the tube is a little gassed (in which case I'd expect other problems). I don't know a thing about rejuvenators, but it seems like the B&K 440 is widely available for decent prices on eBay. Would that be suitable for a mono tube? - Dave