it should work fine. I would start with the TV Volume down all the way though.
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Even for casual listening, the lack of clarity and background noise (that I hear) makes it not even mid-fi compared to even a humble preamp or integrated amp or even an A/V receiver.
Get a cheap Onkyo A9555 for a few hundred $ and you'll be in much better shape. And the remote on the Onkyo is very powerful so it's good for a TV situation (& you can buy extra remotes for a few bucks).
Were you using the Adcom preamp to listen to the TV before it failed?
If so, I doubt if the audio quality will be much different with the TV amps driving the power amp.
But, I would be careful that the TV did not blow your preamp with turn on/off transients. May do the same to the power amp.
I had a lot of problems with HUM and noise levels using the TV as a source in my audio system. This was due to ground loop problems from the local cable TV grounds. If you have sat source it won't be a problem.