HELP ME add tube amp to my HomeTheatre

I recently purchased a 2-channel tube amp rated at 60wpc. I would like to use this for my mains, as I use my setup for music 90%, home theatre 10%. HT receiver is a Yamaha 995 which has preamp outs for all 5 amplified channels. Should I simply go out the main preamp outs and into the inputs on the tube amp and use this as main amps for music and HT? Any considerations I should review? Also, any suggestions on the cables to use from preouts to amp in? I'm a "newbie", so any input would be appreciated. Thanks...Steve.