Hey guys, So I came across a F-800B for the first time since I started looking in '05. Being a huge Death From Above 1979 fan, it was on my list. I received it yesterday and bought a cab today. 4x12 and I don't know the exact load off hand but it is for bass. It is also a Peavey and when I played a guitar head through it at the local guitar shop, it sounded great; a nice bass-y crunch. So it's not the cab. Now, when I run it through my setup, I get a very high pitched scream. I can play with it and quiet it with the 2500 eq knob, but I lose all high end. It does go away when I roll off the overdrive, but I want to crank it for a DFA1979 tone. I can't even get the volume past two without a literally painful squeal. I've tried other guitars and it has to be the amp. Any ideas? Thanks!