Tgrisham and Phd have nailed the term, "transparency" to a tee. Further- If the recordings you are listening were engineered/reproduced with an unfortunate hand/ear- The transparent amp that faithfully reproduces the shortcomings IS NOT the liability, the recording is. The ambient info Phd mentioned is usually lost in most(but the higher priced) SS amps. Again I have to agree with Phd about the BAT pieces, and for the reason he sites: less in the signal path(one reason tube circuits are better- simple topography). That's Victor Khomenko's(of BAT) design philosophy. Placette makes an excellent(all bulk-foil Vishay resistor) passive line stage, IF your sources have sufficient output. I've never used their active(with gain) unit, but it is supposed to be close in it's transparency. Don't forget- there are a multitude of cables/interconnects that will affect your signal transfer/purity as well. I've found Kimber Selects to have the least impact, in my system, after much wire-tasting.