So I have a Mesa 400+ running through an Ampeg 410 hlf and I'm getting some odd static coming through. It sounds kind of like the static on Useful Idiot from Tool's Aenima CD if your looking for an reference. I recorded a bit just to show what the static is as well: http://soundcloud.com/luke-wyman/bass-amp-noise It's just at the beginning and end of the short clip and you can hear it almost cycle through the static. Careful the middle section's loud with the different pedals. So far I've found that it's not the bass or the pedals and it does it through both inputs 1 and 2. Also it doesn't matter how loud I turn up the amp the static stays the same volume. Could it be an issue with needing new power tubes or a loose connection somewhere? This is my first all tube amp and the tubes in it a pretty old so I was thinking that but would like to hear some other ideas first. Also this just started happening about a week or 2 ago. I've gigged the same set up a couples over the last year and practiced weekly with it over the last year and had no static issues.