FT Audio/ Passive Preamps - Comments?

Any feedback on this preamp? I would like to add switching capability to a simple SET based system, but would like to change the sound as little as possible and definitely not degrade it at all. The amp that I use (Audion Silver Night) has a single volume pot, but accepts only one line source. I have already tried a few good active preamps with this setup and they changed the sound quite a bit and it was not to my liking. Because of this I am now wondering if a passive preamp might do the trick. I had originally hoped to pick up a used preamp with phono (AI, BAT, etc.), but having already tried an AI (which I really like in a friends system) and hearing the difference it made to my setup I have a feeling that I may be wasting my time trying to combine an active preamp with this system, considering what my goal is. The true integrated version of my amp retails for $3200, so that's out and the Placette that has a very good rep is also too high considering that I will need to pop for a phono as well. Any suggestions? The most I would need to add to the system is a CD changer for my wife and a phono.