First I gotta say, some cabs full of g12-65s are pure ambrosia, others are merely terrific. I'm curious what the 65 lovers thoughts are about how the sound changed from say 79-83. If you have one in a 4x12 with 3 other mixed speakers you really aren't hearing the 65 due to its low efficiency. I'm more interested in the folks with sets that aged together. I have 3 matched quads all in cabinets. I also have 3 more singles. Even though the dates span a couple months on some quads, I am sure each set grew up together. I will, for ease of labeling, name the quads 79, 80, 83. Set 79 has standard white paper labels. 80 has Marshall brand labels. 83 is paper again. The 83 set sounds very, very much like vintage greenbacks to my ears. I hear greenbacks as slightly mid scooped with a bit of sizzle on top. My 79 set is my favorite, it curbs the sizzle while still managing chimey highs. The lows are tight, maybe lacking to some people. The mids are smooth, with no hump. The 80 set is much like the 79 set but with a bigger bottom while still tight. I thought it was the B cab it was in, but I moved them to an A cab and the same thing. Here's a funny thing, I have a single 83 in my DSL combo and its exactly like the 79 set. I also have a single from 81 that has the exact same celestion label as the white paper but the label is a silver metallic looking base. All of the cones have the same number. What else have the hardcore G12-65 owners found?