[time-nuts] CBT EOL

[wa1zms at att.net]

When a CBT reaches end-of-life, is it because the source of Cs is used
up? Or is it due to contamination of the electron multiplier?

I've heard both as causes but wanted more info.

I have a CBT with very low beam current and it keeps falling. I'm wondering
if running a higher than normal EM voltage might help keep it on life-support.

-Brain, WA1ZMS/4