If I'm looking for "Tube Sound", why would I put a Tube Pre in front of a SS amp?

I use a tube Pre (Ayon Eris) and SS Power Amp (Pass x150.8) and it sure works for me.

I note that Rogue Audio build integrateds that use tubes up front with Class D power modules - I have not heard them but they are well reviewed.

Using my Manley Steelhead to drive newly acquired pr. of Pass 160.8s to my Avalons. Out of the box; the 160.8s had the best control of the bass that I have heard with the Avalons. Day (3) soundstage is wide, deep, layered. Midrange is to die for, highs are getting cleaner and starting to  shimmer. Bass is more articulated (micro & macro) imaging is superb. Last bit of palpable imaging and air that I suspect that I would get with tube amps is the only thing I could want yet; but superior bass control is what I will keep. I have been looking into NOS tubes. Not sure what various tubes will bring; but can hardly wait since this will be a 1st for me. So far I am definitely happy with my "divorce from Spectral " Instead of hyper details, I still have the details but everything sounds natural, No listening fatigue!! Sounds great at low, normal, High volumes. We are having our first "cool" spell in the Midwest. Amps keep listening room at 75 degrees!

Mapman&Atmasphere - pertaining to tubes and Class D - for the past 4 months I have been using an Oppo 105 (Exemplar Audio mod) as a preamp/DAC - this has a tube output stage - next in chain is a Rogue Audio Hydra power amp - this has a tube input stage followed by Class D - I have been VERY pleased with the results! By the way, this is feeding Spatial Audio M1 (open baffle) speakers