pre-amp with home theatre pass through

Modwright SWL 9.0

I believe it has what you want.

Sell your old one and pick up the RDL1 (used)

Sonic Frontiers Line 1,2 and 3 also the Gamut preamp

I have a SF Line 1 with a similar setup. The HT passthrough is great. If this is your main TV which is on most of the time, keep in mind that any tube based pre-amp is going to get alot of hours logged on the tubes even while in HT passthrough mode, at least that's the case with the SF.