I'm not sure where to post this, but I am wondering if you guys may be able to help me out. I recently turned on my my SWR Workingman 15. After about 15 seconds of playing, I heard a loud pop. Now all I hear is a buzzing sound that is about half the full capacity of the amp. I can still hear my bass playing, but it is barely audible with all that buzzing. Any suggestions of what might have happend? thanks!