Hey all, I am super happy because I just snagged a twin reverb for a great price! I found a guy selling a perfect working condition 72' twin reverb for 500 bucks.......The best part is the amp had the factory upgraded speakers....meaning two JBL D-120s !!! This amp sounds great to my ears, and gets beautiful clean tones. Does anyone else have any experience with these early 70's twins? What do you think of the master volume control? Any thoughts in general?