For a non-tube counterpart, I’ve been looking for something powerful that can handle 4 ohm speakers well. The Parasound A23+ is a contender. It and its big brother, the A21+, measure 33k (unbalanced) and 66k (balanced).
Open to suggestions on balanced amps that can handle the wild specs of the RH-5. I would prefer to use the balanced out if possible, but if the best option is unbalanced, that’s cool.
I know this is a “headphone amp”, but it does really feel like a design flaw to not be able to use the two different preamp outputs without careful system matching and potentially not with the same amp!