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24.15.35.211
In Reply to: RE: Rainbow Flashing posted by Triode_Kingdom on September 23, 2015 at 22:53:57
In the last paragraph he writes:
"Let us make a blanket statement, to adequately cover the subject of tube viability: the only way to accurately determine the health of a tube is to test it electrically. Period. Anyone who discards a tube, because its getter flashing is slightly discolored, is wrong."
NOS Sylvania and Philips tubes are notorious for having "rainbow" edged getter flash. It's completely normal. And the vast majority of them test just fine.
So I think saying the article is incorrect - is not exactly correct. But proper testing is an additional way to screen out tubes with issues in many cases. Observation of the getter flash alone is not the final word on a tube's condition.
Follow Ups:
Are we still discussing power triodes like the 211? If so, I stand by what I've said. The article is wrong. To quote:
"(chalky white all over)... is the only case of a getter flash visually indicating a problem in the tube."
Absolutely untrue, and I have seen the physical, real-world evidence. You know, I only posted this experience thinking it might save someone else some grief. I lost hundreds of dollars on those tubes and felt damn stupid when it was all over. I don't want to argue about it fifteen years later.
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Buy Chinese. Bury freedom.
I was just saying that in some cases on some tubes (not necessarily a 211) some rainbowing is pretty much normal.
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