Small vinyl system..Thiel, Musical Design preamp, + ? Acurus amp?

I had an Acurus A250 years ago and sent it to Mondial twice for repair (free, but still)…no clue if that's typical for those, but it was annoying. 

i had a  cj pv 10 with that acuras i had ,i think it was 150 w

Trying to jog my memory, but my recollection of the Acurus  was that it had a rather low input impedance which might be a concern with some tube pres. The sound of the Acurus amps as I recall, had bass that competed with much more expensive offerings, but alas the upper range was quite chalky.  That chalkiness might(?) be alleviated with a tube pre such as your Musical Design SP 2B (which I have no experience with), but otherwise IME would not mate well with the Thiels. A 12 X 12 room can be quite challenging as well. Good luck.

i think i have one of those in storage somewhere