hey everyone, back a few months ago i had some problems with my SWR 750. the power section had completely failed, and i got my step-dad's brother to help me fix it. he was able replace the power transistors and resistors and what not for a whole lot cheaper than a shop would do it for. now here's my new problem. im afraid it is a sign of power failure again. it started out that i thought it was a problem with my tweeter because the sound comes right out of the tweeter. but after playing through other speakers, my head i still having the same problem. there is a crackling, sort of distorted noise that stays constant. as i turn the volume knob past about 9 oclock it makes a swirling sound as i turn it up, and when you leave it at any spot about 9 oclock the crackle/distorted noise gets louder and its a little worse sounding. i was just wanting to know if this could just be a scratchy volume pot, or if it is actually the power section beginning to fail...and if so what can i do to prevent it from doing this. thanks!