I am trying to put together a second rig for Camp Bisco and I am wondering if MG m270> PS-2 > AD-500 > JB3 would work. In other words, would the AD-500 provide enough gain w/out having a Pre in front of it? I only ran the AD-500 a few times, and always w/ a Pre. I have the manual, and I think this will work - but I could not find sources on archive.org that list this combo so I am not so sure. Any help would be appreciated. Cheers, ingsy