If it were me (it's not), I would not want my tubes being powered-up when listening to HT (which could be often, depending on your (you're families) watching habits.
A great, but not inexpensive, option might be a Backert Labs Rhumba 1.3 pre-amp. Reviews are very good. And, to engage HT bypass, you power off the pre-amp. No hours put on the tubes when watching HT.
Of course, before spending any additional money on a different pre-amp, I would want to insure the noise was caused by the existing pre-amp and is not coming from the HT electronics.