So I recently had a Philips Alto f40t12/d, one end wasn't lookin so good since I left it on and didn't notice it running cold cathode. The filament was still intact though, when I accidentally installed it with 3 pins connected on my electronic ballast the bad end glow orange for about 3 seconds then the lamp dimmed out. For a bit I think it still glowed a very dim color next to a plasma ball but it doesn't do anything now. I've peered inside the bulb, the entire bad filament is still there. Any ideas what caused vacuum loss on this lamp?

Poor adhesion of the glass to the lead in wires, crack in the glass that just propagated through the whole material,...

Makes sense, pretty unfortunate, I guess I'll be getting some new ones soon.

Also overdriving the lamp with the wrong ballast, like connecting the 36W fluro to a 55W SOX ballast or 58W fluro ballast, after like one hour the lamp extinguishes and you can hear the "hiss"

I've heard two eol tubes hiss, both of em startled me. The f20 was super loud, I knew the f30 was coming because there wa s alittle hiss at first.