  Barium plated getter.
The shiny flashing on the inside of this tube is barium metal put there for the purpose of reacting with and thus neutralizing any residual oxygen or moisture left inside during the manufacture of this vacuum tube, or that leaks in over time.
Source: Homer Auction
Contributor: Theodore Gray
Acquired: 11 March, 2009
Text Updated: 17 March, 2009
Price: $0.10
Size: 4"
Purity: 99%
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