If you mean without changing preamps, the answer is not without significant hassle. There are preamps with what is called theater pass-through which make such a setup hassle-free, but most do not. Otherwise, you're having to wire things strangely, make sure volume settings are just-so, and being very careful or changing cables for different functions.
If you mean can you have a good two-channel system, including phono, conveniently in the same system as HT with the multiple channels, the answer is absolutely - there are many possible solutions described in a couple other recent threads that you might want to look up.