I've got the old jaco amp: the beast, Acoustic 360 with 361 head or vice versa I always get it confused. It works great. I made it safer by profesionally installing 3 prong grounding wires instead of the 2 prong so you don't get shocked when u put your mouth on the mic. Does anyone know how much these amps are worth? particularly my amp... Ive included some pictures for reference.