Tube Preamp with Solid State Amp?

Have been mixing SS and tube for some time but the tube preamp and solid state amp is the least hassle. Tube power with all that heat, run away tubes, and bias adjustments is high maintenance.  I do it (run tube power) in the winter but more heat here May to October is no fun.  I have Audio by Van Alstine tube preamp and MOSFET power in an ancient Dynaco chassis.   I can even stand cd with this combination.  

The Pass XA30.8 input impedance is 100 K ohms balanced, and the input capacitance is just a few picofarads so anything will drive it.

I have a Rogue Metis pre with a SS Amp and love it. Very little noise. What tubes you choose does make a difference so you get to do a little tube rolling and that’s fun.  

I have used a tube preamp (Audio Research Reference 3) with a solid state amp (Audio Research 100.2) with medium efficiency speakers (89-90 dB) with great results. As stated above, it gives you the best of both worlds.  You get the 3D soundstage with tubes and bass control with solid state. For your highly efficient Cornwall IVs however, I would suggest a SET tube amp (e.g., Coincident Dynamo) or a lower wattage tube integrated such as Quicksilver, Leben CSX300 (15 wpc with EL84 tubes) or perhaps Linear Tube Audio 10 watt ZOTL.  I have a Coincident Dynamo 34 SE mark ii amp (8 wpc) with my Klipsch Heresy IIIs, which offers very good bass control for a SET/SEP amp with EL34 tubes, excellent 3D soundstage, but more of a clear detailed solid state like treble (rather than vintage buttery warm tube sound) with rolled off smooth highs. Just one more opinion. Good luck!

If you like Maggies like I do, solid state amps are mandatory and adding a tube pre produces a warmer, more holographic soundstage.  Right now I'm enjoying a Marantz 7c with a Mark Levinson 23.5 amp into Magnepan Tympani 1-D's.  It's H-U-G-E!