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Re: NO

OK, bad science! Lemme restate: The preponderance of evidence suggests no proven mechanism for aging within a adequately sealed vacuum tube.

This is because glass to metal seals were perfected long ago and chemical reactions happen very slowly - if at all - in a vacuum. If anything is happening it would be happening outside the envelope. But, I'm open to ideas- what do you think would happen to "age" a tube in storage? And is this a continuous process or does it reach some sort of equilibrium? If so how long does it take to reach the equilibrium? And if continuous does this mean that "aging" will continue forever? If the later is true there should be some way to "measure" the aging using valves of known age whose construction changed little. Or conversely, to determine that age of a stored tube of consistent construction but unknown date (I'm trying to figure out how we could set up a "double blind" experiment.)

Again, I think not but am willing to explore the idea.

Generally I think the primary difference in new manufacture and that of the past is the loss of engineers, labor, and supply that "grew up" with the industry. You mention mica so I suppose that you are aware - at least according to my geologist friends - that most of the high quality easily exploitable muscovite deposits in the continental USA are long gone? Muscovite is a potassium aluminum silicate and not known - as best I know - to contain gasses. And I would assume that the muscovite was "baked out" before use but I could easily be wrong.

So, while we probably still disagree I'm open to any evidence that isn't based on subjective opinion cuz I love mangoes but really thing chocolate tastes nasty .

Rob

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