I agree with @gregjacob that KT170 sounds rather different from 300B. I've heard a couple 300B amplifier (Takatsuki and AirTight). KT170s have more excitement and 'meat' in their sound.
There are a couple more highly regarded KT170 options. Jadis I70 and Lab12 Integre4 MKII. I'm using the Lab12. IMO, it is identical in performance to the more expensive Jadis and far easier to live with. I've not heard the Allnic though it seems to be highly regarded.