I realize that this doesn't exactly go in this thread, since I am talking about my Quickie, but I have tried the Herbies tube dampers. Since they wer mentioned previously in this thread, it seemed ok. Having said that, I have a short term impression about the results. With the 3S4 tubes, damping of any sort is beneficial as compared to nothing. As much as I enjoy these tubes, micro-phonics are in full swing and can even lead to a harshness of the treble, as well as a muddiness in the bass. Suffice it to say that tube dampers did as much as anything else I've tried, with an improvement in the treble harshness. I can now turn the little Q up higher w/o fear of ear pain/wincing. You know, waiting for that part in the song that is as edgey as a rusty razor. Less offensive, but quite welcome is the increased bass definition that I heard. Back to notes not thuds(not quite that dramatic but you get the point). So, at such a low price, these dampers are one of my no-brainers, or ,or, you can continue you Frankenstien experiments ERIC,,,,I won't judge.