[Milsurplus] More and More "Gassy" Tubes
Todd, KA1KAQ
ka1kaq at gmail.com
Mon Apr 21 09:17:52 EDT 2014
If they're WWII era, they might be suffering from the same marginal
material issues as the 100TH, 250TH and similar tubes of that time. As it
was explained to me, corners were cut in some areas like purity of metals
used due to the demand, time constraints, and life expectancy in combat.
Over time these metals have released their nasties into the vacuum. Many a
NOS 250TH destined for a BC-610 turns blue when opened and used today. If
the filament is even intact. Brittleness is another issue.
While there are no doubt plenty of tubes that have turned gassy due to
leaks, I have boxes of tubes from the 20s-30s here that are just fine. So
age alone *shouldn't* be a factor (yet).
On Mon, Apr 21, 2014 at 9:05 AM, David Stinson <arc5 at ix.netcom.com> wrote:
> I'm starting to see more and more "gassy" and shorted
> tubes lately. Even the venerable 1625. Not a lot- probably one out of
> 12-15, but that's way more than I saw a decade ago.
> You think these near-century-old envelope seals
> have a "shelf life?"
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