Hey. I'm new to this forum. I have a 1992 Dual Rectified Solo blackface head that I've owned for 15 years or so. Never really was a gear head. Just knew that if I plugged my guitar in, the amp sounded badass. Recently started looking into the history of the amp. The serial number is R0012. I've seen references to different revisions on here, and I was wondering if someone had any idea of which revision this amp might be and what makes it any different from others. Thanks.