Glory,
I have the original TP 2.0n version and I love its natural sound. It is far from being dark or muddy. Of course, it is dependent on the power cord, interconnects, and tubes used in the system. In my system, using Von Gaylord Chinchilla interconnects from pre to amp, Fusion Audio Impulse power cord, and a pair of early Siemens Cca tubes in locations one and three, the sound is very lifelike, dynamic and natural. Also, buying new from AH gives you the return policy if it doesn't synergize in your system. I'm not in any hurry to do any upgrading with my preamp. Please also note that I was one who spent the $375.00 to upgrade to the 2.1 version and I eventually went back to my original 2.0 version. YMMV. I personally feel that you'd have to spend a great deal more money to get a better preamp.