Hola, I was at rehearsal last night and I got this annoying distortion sound from my cab. My setup is a bassman 300 with 2 210 avatar cabs. I previously had a vibrating noise from the cabs before, and I just had to screw down the speakers. Problem solved. My band plays really loud and we were paying by the hour, so I went through practice and played it out. I tested it out today to find out what the problem might be on both cabs. Heres what happens: On either cab, I get this hissing noise when I play at louder volumes - that almost sounds like a "plane taking off". It happens the same on both cabs, so I don't think that it is the cabs. Could it be the capicitors? The power tubes look fine. Should I take this amp in to a tech? Any advice?