Back to the original question. We really do need more info on your speakers, music and likes/dislikes to make a meaningful recommendation. That said, I’ll infer that you like the sound that tubes impart - so that argues for a tube preamp as well.
However, tube distortion (which can be euphonic) plus *more* tube distortion might be too euphonic, but others might think its perfect. And why limit one’s self to McIntosh? There are lots of tube units to choose from.
But the best advice I can give came to me when i wanted to learn about wine, from a terrific local sommelier: "pop a lot of corks" was his advice. As you hear different gear you learn to appreciate what is what. But always remember you are hearing a **system** --- the net sound of a recording (hugely important), front end (CD/Turntable), preamp, power amp, speakers and room (also hugely important). Note that the two things i said are "hugely important", you have little control over.
G
