guys i've been having a hell of a time with my b-52. I got the B-52 3 weeks ago NEW and the clean channel would not click on... so I called guitar center sent it back and just got my replacement today... well... the clean channel clicks on but it pops and cracks like crazy. On overdrive there is no popping or cracking at all. I do warm my amp up first in standby for 5 mins or so before actually playing. Could this be a bad tube? according to B-52s warranty they warrant the tubes 90 days after purchase. So i may give them a call this time around and see if they might send me replacement tubes. What everyones thoughts on this issue?