Hey all, I am having a HUGE amp problem. I just bought an Ampeg (lead) half-stack from a friend. The problem here is that there is a crackling noise coming out of the right speaker. There are 4 speakers and it is only comming out of the upper right one...I took the amp in and got it looked at (blowing $30) and they told me there was nothing wrong with it. Then, I ran the head through another amp and realized it is a problem with the head because it did that crackling noise through this other amp. So I go to guitar center and described the problem to this guy who said it definently was a tube problem. I got my pre-amp tubes checked by a machine at a electronics shop that said they were fine, plus this guy said it sounded like a power tube problem. So I buy a pair of 6 rating groove tubes and put them in and take them to another shop to get them biased (blowing another $80) and when I got the head back, the problem was excactly the same. I don't know what to do...I keep taking it places and blowing so much money and nothing is changing..it is a VERY stressful situation. Can someone please help? The noise it makes it a crackling noise almost like an overdrive but it is very anoying while playing clean...it also is very noticable with distortion on. Any help with this problem would be greatly appreciated..thanks a lot, take care!