So, my teenage daughter was gifted one of these (barely used: < 20 times) by a good friend, who shipped it cross-country. We're about to reinstall the tubes and connect everything back up, and I'm stumbling on a dumb little thing: the dangling RCA plugs that appear to be coming from the reverb tank at the bottom. They seem to need to be plugged into the jacks on the underside of the back panel. One wire is thicker and gray, and the other is thinner and white. My question: which plug goes into which (unlabeled) jack? I would describe their placement as a jack closest to me ("front" of back panel) and a jack behind that ("back" of back panel as I face the back panel). I guess I can try each way and see which sounds right, but I thought I'd ask people in the know. Thanks in advance -- Mike