Tube or solid state

I read the question four times and I still don't understand it.

Okay, I am now using a tube preamp and a gan SS amp but it is because of the speakers being very inefficient. I do have a modified ST70 tube amp but the bass is not as defined when I use the Magnepan speakers system. I also have a tube dac but it is not very new and I find that the newer ( cheaper) dac seems to have more layers and wider soundstage. 

I agree with the majority of opinion expressed here: tube/tube if possible. Of the many combinations I’ve used, it’s amazing how vintage circa 1960 tube gear can compete and often best modern gear. Challenges so many notions in this hobby. Current favorite combo: McIntosh C20 > Marantz 8B > high efficiency horns. Fisher 800c excels as does Citation I & II. Tube just rises to the top in my experience. 

Tube preamp for the sound and SS amp for the power and generally cooler running. (Class AB)

How about the hybrid McIntosh MC451?  Can anyone speak to its performance?