Seeking advice--upgrading decades old audio system

Returning to high end audio after decades and looking for advice. Please suggest a few pre/amps /brands I should look at ($5K or prefer less for preamp+ amp) and anything I’m missing. Also given room size ? need at least 150 watts?

Speakers: Mirage 3si (have)
Source: Plans: streaming (? tidal) + downloading my CDs into ?bluesound vault.
     Feel free to post any suggestions as this part is all new to me. No LPs.
Pre/AMP: tube or solid state with the class A kinda sound. No class D.
Room: system at one end of room 15’ wide, 15’ ceiling and 40’ long.

Thanks for your time.