If you aren't wanting to power both zones at the same time, and can go without the tuner, then perhaps the Audiosource AMP-100 ($80 at
Amazon) would be a better choice.
I know that others here have good ideas about this stuff. Give it some time, seeing as how it's Sunday and a number of people aren't on the forum right now.
I'm guessing that your brother doesn't have another receiver to give you.
BTW, do you know what is wrong with the receiver that you have? What isn't working with it?