ARC REF160Ms or REF160S would fit the bill, but not sure how much of a step up they would be.
Also, I suspect many manufacturers will be upgrading or releasing new amps due to the availability of the new KT170 tubes (assuming they are available, lol)
Also, I suspect many manufacturers will be upgrading or releasing new amps due to the availability of the new KT170 tubes (assuming they are available, lol)