Hmm, if you smashed the CRT neck and let the vacuum out, you're really out of luck on that SE/30 . You would need a new tube, but you'll also need to replace it and then do an adjustment.

I also been there, done that. You probably left the CRT board on? I did that, so it was really easy to smash it. I was just unplugging a yoke connection or something and when it got loose, my hands flew towards the CRT neck. Sadly it was a very low hours green phosphor XT screen, which is even more rare than a monochrome compact Mac CRT.

Now I ALWAYS take the CRT board off first, before doing any work.