Fryette Power Station is best I’ve found so far.
Although, in theory… A very transparent SS power amplifier would be the best suggestion, I much prefer the Fryette powerstation tube power amp.
In my opinion, the only weakness of the Kemper is when playing into guitar cabinets… it does not sound or feel quite like the real tube amplifier it profiled…
Using a real tube power amplifier helps this issue, it does not fix it, but it does help...