[Milsurplus] Tube storage?

[J. Forster]

> I've worked with high vacuum quite a bit and it takes a lot of energy to maintain a good vacuum in a decent sized space.  I don't think it's very practical.

> In my experience testing quite a few tubes (>200) from NOS WS 19 spare valve kits, about 90% of them are fully serviceable after 60 years of storage. These were things like 6K7s and 6K8s....  octals with plate caps. Of those that tested gassy, many were
> able to be degassed by operating with filament voltage and plate current about 20% of normal for a day or two and then tested fine.

FWIW,
-John

> Has anyone considered storing their tubes in a high vacuum?  Hard vacuum is a lot easier to come by these days than it was historically, so that would be one way to preclude migration through the envelope.  Or is internal out gassing the real problem?
>
> 73,
> George
> W5VPQ