Experience of ITS1A lifetime?

[Nick]

Hi - Anyone know how long these last?

During the holidays I built a "Mr. Nixie" thryatron clock using ITS1As - lovely thing - very pleased...

...but I was wondering about the lifetime of these poorly documented tubes...

Anyone got actual experience of these?

Thanks

Nick

[MichaelB]

I have three of these little gems and the oldest I built about 13 months ago. No issues with the tubes and none are showing any signs of degradation. They run most all day long.