I have read volumes on the subject of the all tube heads and their virtues. I have, likewise, read the same thing regarding solid state. I understand why some people prefer one over the other but what I do not fully understand is the growing debate over old vintage and todays models. And this is particularly true in the solid state camp. I have heard numerous explanations from the tube enthusiasts as to why todays SVTs dont sound the same as their predecessors. However, the solid state cognoscenti dont seem to be as vocal on the subject of, for instance, why an Acoustic 360 head sounds superior to a modern equivalent like EBS or Eden. One would assume that with the advances in technology since the early 1970s the electronics in the preamp section would be more responsive and versatile and that the power section would be more stable and reliable. So why do so many people seem to covet these old models? I have heard some tube-ists swear that todays environmental laws prohibit the manufacture of a good old fashioned tube which affects the sound. Did the solid states of the 60s and 70s use some special kind of rare transistor made by Japanese monks? Anyone have any knowledge on this subject?