Newbe PC audio


I have a big time Cary Audio Tube amp and pre amp and really like the tube sound but would love to hook up my PC Audio internet through a lite DAC that I have to my tubes. I am totally ignorant as to how to get from here to there. Can anyone help????
markus1299
I have no experience with firewire but have used USB connections between both an iMac and Macbook Pro to Peachtree Decco and NuForce Icon amps with built-in DAC's. I've never experienced dropouts in any configuration with that gear.