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!
 

Are these mechanically broken or really EOL with large black 'socks' at the ends?

Lamps with mechanically broken cathodes can be reused on instant start ballast, ones that are truly EOL better be let RIP in recycling. Until some really collectable. May be some tesla coil experiments so electrodeless use...

The one with 2 broken cathodes is mechanically broken, the other 3 are EOL.