Why would you want to do that except for the fact that you don't have enough power for your speakers which I doubt, or if this is a temp. measure until you can properly update. If you want to update get a good amp and preamp.
I used my good Rotel RA-02 preamp outs when I first got a power amp. I was blown away by the change - esp in dynamic control - when I went to a dedicated pre-amp. So what you're suggesting is certainly OK but I think it would be an interim step for you.
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