Yikes! Another CT-100 !

[TubeType]

Originally Posted by jr_tech

I 100% agree with your observation... even though some "silver" is seen in the center of the getter flashes, the other side of the getter is likely to be white and "used up". I suspect that if the tube is powered up with a tube checker the heaters will quickly burn out from excess current, if they are not blown already.

jr

Jr,
I'd recommend testing the crt for gas (air), with an HV source, before connecting a tester.