Yes count me as another vote for Mad Scientist's tube toppers. Bought 6 to "crown" each preamp tubes. The effect isn't what I expected after buying the disks, cupcakes, and sticks. They all made a clarity difference that was transformative. (Even I'm getting tired of saying that) But seriously, the tube toppers calmed everything down. The music seems strangely more relaxed, deliberate, and a previously unrecognized sense of irritating "jitteriness" has evaporated. Made me feel like how vinyl sounds in its creamy consistency but without the other stuff. (Full disclosure I use both CD and Vinyl) You know how vinyl has that indescribable wholeness? Tube toppers gave CD playback that magic cohesiveness. Highly recommended for tube aficionados.