Love the look, but they look like a pain to deal with. I checked the
summary page at Herbie's [remember, of course, they are competitors] and found this:
Quote:Tube Anchors/Brass Rings: Though awkward to work with, Tube Anchors by MapleShade are excellent sonically, the only dampers we have tested that play in the same league as our damping instruments. Massive brass clamped around a tube, however, deprives the glass bulb of air ventilation needed for cooling. Our tests with brass Tube Anchors resulted in fairly cool-running input/driver tubes running an average of 33.8º F hotter than without Anchors. Other manufacturers make brass or copper sleeves and deceptively imply that they are tube "coolers." They are not.
33.8 degrees hotter sounds like a lot to me.