Thanks for your kind words.
Last night I set it up, and got a "cable error" message on the C1000 controller. So I turned everything off and checked the cables and just couldn't see anything wrong. One thing I noticed when going over my dad's instructions was that in Step 4, he had a Cardas cord going from an amp to a connection on the tube amplifier on the right, but nothing on the left, and there was an extra Cardas cord in one of the boxes. So I decided to try it, and when I turned everything back on the cable error message had disappeared. It might have been a coincidence, I don't know. But for now I have them both connected, and the system seems to work well. Any thoughts? Should I disconnect the other MC501, or leave them both connected to the tube preamp?
On another note, it was a very emotional experience last night. My wife and I sat on the couch and listened, and it was as if a presence had joined us. My dad was always searching for a particular sound, and he spent years mixing and matching equipment to get exactly the sound he wanted. You know how you can identify a musician by the way he/she plays, or a singer by the sound of the voice... well, that was the kind of sound my dad's stereo had... so when we put some CDs in and listened, it was like a little bit of my dad returned and joined us, because everything we heard sounded just like him. It's hard to describe, and kind of weird, but it's like the equipment affected the music so that it sounded more like him, or the way he was hoping it would sound.
Anyway, thanks for all the great advice, and if you could help me out with the question I have about the amp to preamp connections, I would be very grateful.