I pulled up the 901 owners manual and am still confused about the hook up requirements so I can't provide any help. Hopefully, someone else has a better understanding of what you need.
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If 2-channel is all that is necessary, why not look at stereo receivers or integrated amps?
Almost all NAD integrated amps have both preamp out and amp in jacks -- should work just fine.
Harmon Kardon is another choice: http://www.harmankardon.com/EN-US/Products/Pages/ProductCompare.aspx
Best of luck.
A lot of today's A/V receivers don't have the current those 901's took to drive.A stereo receiver may do the job. Something stereo, with a lot of watts may do better than the new A/V receivers.Plus the remote.Double check everything she has hooked up to make sure they will out put everything in two channel mode.You might have to go into the menu settings for the sources(DVD,CABLE,etc.),for that.