"The Tube is a collection of excellently played baroque music using Tubes though out the entire recording process. On the back of the SACD it says "No conductor - no semiconductor - I beg your pardon." The players on this SACD are the Stuttgart Chamber Orchestra and they have no conductor. The booklet explains how semiconductors were avoided in making this SACD. From the 2 Neumann M49 valve microphones, the tubed mixer, to the restored tubed Telefunken M5 2 channel Stereo Reel to Reel, to the editing by hand up to the DSD converter which does use semiconductors. However the booklet says "… in the course of being converted the signal does not pass through any transistors, but rather adjoins them and is measured: The transistors cannot 'pass on' any of their properties to it's sound. So we can rightly claim that for the music recorded here no transistor effected the sound in any way all at.