[Boatanchors] Smart People: Gassy Tubes Reversable?

[hwhall at compuserve.com]

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

Hi, John. I think you are referring to gas diffusing through the tube envelope? I hadn't considered that. I was assuming gas "leaking" in or out via wire lead seals, sort of like through nano-cracks between materials. 

73,
Wayne
WB4OGM