I would like to keep my receiver in the chain and add tubes and somehow have some kind of switching. Would like to be able to listen to 2.1 and then push something on my Harmony remote to switch between music and HT set-up without having to touch wires.Niles audio SAS-1 is what you need!
Make sure to add two150ohm 10W resistors across the speaker post on tube amp side.
SET tube amplifier is addictive:
https://www.amazon.com/MS-650B-Single-Integrated-Amplifier-Control/dp/B011BNO5UK