Successful Rebuilt of a 15GP22 at ETF

[NewVista]

In case I missed it, how do you tell if a tube like 15GP22 / 21AXP22 has air ? As you would want to know and be cautious testing. Do they all have neck getter to look for for instance ?

[JB5pro]

Originally Posted by NewVista

In case I missed it, how do you tell if a tube like 15GP22 / 21AXP22 has air ? As you would want to know and be cautious testing. Do they all have neck getter to look for for instance ?

There is much detailed info about this in at least one thread but if the getter is dark rather than silver it prolly has enought air to burn out filaments. If the silver is good but has that classic "gassy" look to the picture than it is gettin aired up and likely soon to burn out filaments. My info may be off a bit in one way or another.