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RE: Rainbow Flashing

Posted by Jim McShane (D) on September 24, 2015 at 05:37:57

In Reply to: 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.

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