I bought this beasty when they first came out. Butler said he introduced them back in 86. Hmmm, I could have sworn I got mine back before my daughter was born, that was 84. At any rate I still love the tone of the Real Tube, and some say it is better than the much talked about Tube Driver of which he designed as well. How many others still have theirs are use it? Oh that pearly looking thing on the button is a pearlish piece of glass, it shines well in dim light making it a tad easier to see. P.S. The trick with this beast is don't turn the HIs up too much, it does get a tad chainsaw sounding up past 3ish.