I was playing my svt 3 pro through my mark bass 610 and i was playing an old jazz bass copy that my friend had in the rehersal space, and as i was playing it i adjusted myself and the way i was sitting (everyone takes the comfy chairs and leaves me the horrible drum thrones) and apparently the 1/4 jack on the bass was loose, and it kinda moved around and made that horrible loud popping noise and then as i went back to playing it, it sounded as if i had blown pretty much all the speakers at once.. now i was pretty upset cause the cab is brand spankin new. the sound was a very harsh popping and clacking noise everytime you made a peep with the bass. i then tried the amp with the ampeg cabs to see if it was the speakers that were blown, but then those were making the same noise. i then tested a 4 pro through the cabs and everything sounded fine. so at this point i figured out it is deffinatly the amp. after not using it for a few minutes i turned it back on hoping that my problem magically disappeared.. and it did.. for maybe 15 minutes. when the gain and volume are low, im in the clear, but when the volume goes up or the gain goes up at a low volume, i get the clacking. no PLEASE someone tell me im not screwed here and that its something easy like just changing a tube... help?