[R-390] Gettering old tubes

[KA9EGW]

Come to think of it, Bill Kleronomos did an article in Electric Radio years
ago on how to go about reclaiming gassy NOS tubes...I'm really sorry I don't
remember the specifics, but it had to do with applying plate voltage with
some sort of current limiting to prevent runaway...  
73, Brian KA9EGW

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Jerry O. Stern
Sent: Wednesday, March 02, 2011 7:06 PM
To: 'Tisha Hayes'; r-390 at mailman.qth.net
Subject: Re: [R-390] Gettering old tubes

Those strange audio geeks love NOS tubes but they cook the tubes for several
days on filament only without grid or B+.  They swear the getter(s) do the
job 90+% of the time on 50-70 year old tubes.

Jerry
K1JOS

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Tisha Hayes
Sent: Wednesday, March 02, 2011 6:39 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Gettering old tubes

It is just an idea. I recall dissecting some of the tubes with the little
metal halo and found the metal that was left in the groove to be highly
reactive (still). This is the only reason I mention it. If we could
inductively heat the getter halo then some gas scavenging might still
remain.

Tisha
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