Hey Arturo, I don't know if you mean the vacum tube is blowing or cracking the glass tube, but you have a serious problem their my friend and we can't fix it over the internet, so I suggest two things, 1. Do not use the amp or even power it up, you could do farther damage, 2. You need to find a shop or repairman that knows how to repair your amp and get it fixed. OK....................