Congrats on amps. In researching 300B amps over the years, I consider Aric in top tier.
Yes, 300B amps properly executed are one of best for tonality, harmonic development, no rolled off highs, one note bass. I"m also fan of point to point wiring, both my 845 and 300B amps, linestage and phono pre all point to point. Minimal parts count and point to point construction provide for sound qualities I prefer over other designs. Allied to sympathetic loudspeakers, the level of transparency, resolution and immediacy can make it seem as if performers are in room,
I agree with above posts in recommending top tier 300B tubes, WE, Takatsuki, Elrod, EML, Psvane Acme, Linlai Elite will all extract max potential from 300B amps.