[Milsurplus] 2X2 question

[J. Forster]

Scott Johnson wrote:

> It has probably become gassy, or more correctly, is at atmosphere from a
> breached glass-to-metal seal.

The electrode spacing is fairly large in this tube. Since it's glowing, it is
clearly not at atmosphere. 290 V is not enough to break down 0.1 inches or more
of air.

-John

> The bright blue is the classic nitrogen
> discharge color, which is what 80% of our atmosphere consists.