Quote:
Originally Posted by fetteler
I thought the idea of glass flowing over time was a myth that has been disproved.
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I think you are right about this, generally a myth about window panes thickening up at the bottom etc.
However in the case of the valves with bent over electrode structures it is only movement of the glass support where the pins/wires enter the globe that could explain it. The outer globe though never shows any evidence of distortion or deformation.
One other explanation offered for the badly tilted over anode structures was that they were manufactured this way, but that is harder to believe, especially when some have moved far enough to short the electrode structures together.