Primaluna Prologue One power tube rolling

I've tried some EH 6CA7s as well as the stock tubes and JJs. I was curious about trying KT77s since they're another EL34 variant ... and then I got to thinking, what about KT88s.

It has adaptive auto bias so I figured it should work just like the Prologue two, correct? I konw the extra cost of the 2 buys you the upgraded caps, diodes, and KT88s ... but does that mean you CAN'T use KT88s with the 1??