On Wed, 25 Jun 2008 16:12:35 -0700 (PDT) wrote:

The following web page shows several photos of vacuum tubes that glow
because they’re either gassy or induce florescence in the their glass
bulbs. Although the English is a little choppy, the narrative and
pictures are informative:

http://www.jacmusic.com/html/article...w/blueglow.htm

The author claims he’s revived gassy tubes by re-heating the getters.
Has anyone tried this?

I was lucky enough to get a tour of Richardson Electronics (outside of
Chicago) a few years ago, and asked their tube people about this. The
answer I got was an immediate NO.

Apparently, if the getter is properly zapped in manufacturing, there
is no Barium left in the getter loop. It's always possible that some
tubes didn't get properly zapped, but this should be a long shot.

-
-----------------------------------------------
Jim Adney
Madison, WI 53711 USA
-----------------------------------------------