I have four F40T12 rapid-start tubes that are all dead. Three of them have one open cathode and one of them has both cathodes open. Any way to get some fun out of these? I believe they all have maintained their gas fill.

I haven't seen anything on here but maybe I haven't looked hard enough

Thanks!
 

Thanks everyone! I really appreciate it!

@Eleco_SR304: Btw, sorry for your loss.

I hope everything goes well for her. 

I heard some thunder last night and heard some areas had power outages, but didn’t have any here.

That's great! I'm very happy for you!

That is a great news

Finally, after a month, your mother can get help. Hope everything goes right 

I thought it was quite interesting when I discovered it. I plan on making a mini replica someday.

Oh I see, so thinner glass doesn't really crack as easily.

Yep Pyrex is more forgiving in that respect but electrodes are more expensive and you need oxygen burners to work with it.

The secret with soft glass is wall thickness. With thickness of around 1mm the tube becomes kinda 'self-annealing' cooling in the air with some reasonable speed and not creating significant internal tension. Usually does not crack too much until technique is terribly sloppy or material is bad itself.