Home theater and 2 channel setup from same speakers?

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Back in the prehistoric days of Dolby Prologic, I bought a B&K HT preamp and two extra amps (one for the center channel and one for the rear speakers channel).  I ultimately gave up on HT and stuck to developing my 2 channel stereo. 

´´Find the AV receiver’s Home Theater (HT) Bypass or Direct In port ´´

I thought , the OP wanted the Tube preamp to go THROUGH the Receiver.

@maxwave i am not sure that is what the OP wants…
And they also ,mentioned new speaker in the second sentence.
 

I currently have a home theater 5 channel setup.  I would like to add a tube based system and some new speakers.  The room I'm in could probably support both sets of L/R speakers but I was curious if I wanted to downsize speakers, is it possible to run a AVR and tube integrated amp without physically moving cables and such? 

Why they want tubes, is somewhat understandable, but I would assume it is mostly to address things that could be addressed in other ways… for instance with a tube pre, and using some other topology for the amp(s).

And when I saw the HT bypass on my preamp, I started looking into what it meant.

I have a AVP, so it is pretty easy to have that go through the preamp, and the preamp relays the bypass connection when the preamp is turned off.

Mut my AVP is XLRs and the preamp bypass is XLRs. The OP has RCAs so the worst case is that they need to run the HT AVR pre-outs through the candidate integrated.

I will likely be going into amps with XLR inputs, and moving the RCA input tube amps out.
Then I will be able to use a trigger and not have to “toe poke” the amp switch on.

there are probably a few ways to skin the cat, and I have run TV output into a preamp for the TV going through a 2.1 .

Back in the prehistoric days of Dolby Prologic, I bought a B&K HT preamp and two extra amps (one for the center channel and one for the rear speakers channel).  I ultimately gave up on HT and stuck to developing my 2 channel stereo. 

Yeah - started with a well established 2.1, and layered in the HT on top of that.
I think it is easier that way, but it should be possible to start with a 5.x.