You also might want to consider a used 2 channel receiver. You can then use the FM tuner for the music source.Yep, good idea. Or even the NAD 5.1 receiver/CD/DVD I am selling. Just kidding... Not really...Well,sort of ;-)
Most importantly, have fun and don't stress over something like this. I wouldn't let a tube amp run unattended, but then again, I wouldn't stress over getting 450 hours on a pair of speakers before I thought they were broken in enough to enjoy.