Just so you all know...... The main difference between the McIntosh C1000 and C500 Pre Amp comes into play if you purchase "all" three C1000 components, namely the Solid State and Tube units. The C1000 Controller has lavish circuitry so one can "toggle" between the Solid State and Tube units on the fly. If you only purchase the SS or Tube unit you gain virtually nothing in performance over the lesser priced but as equally amazing sounding C500 Pre Amp. The C500 was designed to be used as a two piece Pre Amp whereas the C1000 was truly designed as a three piece setup. I just wish McIntosh would have included the same 3D Glass front panel on the C500 as on the C1000, to me that really finishes the Fabulous Look of this Pre Amp. But that is Matketing at its best or should I say worst. :-) I hope this answers your most of your questions. Sincerely. Dr. Edwin A. Owen.