Hi guys, Im currently been playing and starting to record using my LSC ive found one problem though, My Rectifier tube 5U4GB rattles when playing a couple of notes. i thought it was the speaker but then when playing a note i went back to the amp and held the tubes (from theb ottom) and found that the recto tube was the culprit, i took it out but it looked fine, and seems like it was working and so i put it back in and made sure it was secure but it rattled again. any suggestions? or do i just have to buy a new recto tube. and if so, does it have to be mesa boogie? cuz i dont htink my local dealers sell that tube