[Boatanchors] Smart People: Gassy Tubes Reversable?

[J. Forster]

NO.

The diffusion rate through a semi-permeable membrane detends on the
pressure difference across the membrane.

In the atmosphere that's about 14.PSI

In a perfect vacuum chamber, the difference is between the tube inside and
the chamber, which is at most 1/1000 of a PSI.

It would take thousands to millions of years.

-John

================




> Some otherwise valuable tubes have taken-in variable
> amounts of gas over the decades.
> NOS transmitting tubes like the 211 are often gassy
> out of the box and cannot be readily "de-gassed"
> like some large Eimacs.
> Even some NOS 1625 and 807 are starting to show signs of gas.
>
> Question:  If a batch of such tubes were put into a large
> vacuum chamber, pumped-down hard and left there for
> an extended time- even a year or more- would the gas
> in those tubes migrate back out?
>
>
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