: OK, this problem is pretty recent and I can’t figure out what is could be… : Basically, whenever I even power the amp, it makes this incredibly loud buzzing noise until I turn it off. (REALLY loud)Sometimes the amp will work, but not for long. The speakers are fine, I checked them. I know it’s the amp that’s messed up, but I don’t know what could be causing it. : Any help at all would be GREATLY appreciated. The LTD 400 is too powerful for the case it is in. What you probably have is a capacitor that has vibrated so much it broke one of the leads off anf is arcing. I have had an LTD 400 since the mid 70’s. When I got it I took the board out of it and siliconed all of the capacitors down. I have never had a problem with this amp and I believe this is why.