speaker wiring for h/t and stereo

Line level switch ahead of the tube amp so you use if for home theater too, speaker level switch down between the two, and in the later case care to make sure you don't feed the amp a signal when the speakers (you get more voltage swing when it's unloaded and can cause arcing in the tube or output transformer) which could be as simple as turning off either CD or amp.

Xantech and Niles sell switches which can be controlled by IR or the 12V trigger signal on home theater equipment.

simpler to just have a preamp with HT passthrough, most of the good ones have it.

Macdadtexas

"simpler to just have a preamp with HT passthrough, most of the good ones have it."

Perhaps many of the newer preamps have the HT pass thru feature... new however doesn't equate to good though... nor does having more features such as 'pass thru'.... unless of course Good = bells and whistles.

Short of rushing out to by another preamp as Macdadtexas suggested, you can simply swap the speaker leads between the two rigs when desired... although an obvious pain perhaps, short of getting another pre, and another set of cables as well for the bypass, that works for me...

Of course, adding another set of speaker cables from the HT rec. to the speakers will do it too... You have to be mindful each power source has to be off prior to switching them though.

Separating the two systems seems the best choice so they can run 100% independant of one another.

It's looking more and more like that's what I'm going to be doing pretty soon myself. I'm considering however to use some wall mounted speakers though for mains in the HT... and I'd still be able to use the same dedicated room for both 2 ch & HT.