What tubes are used in the Kora Hermes DAC?

Just picked up a used Kora Hermes (not MKII) and want to know the tube complement and any suggestions for tube rolling.
I owned one but I do not remember the type of tube but I remember when I replaced the Phillips with Telefunken Falcons it really came alive.

I popped the top and found (2) EH (Sovtek) 6922's. I have a couple of NOS Amperex BB 6dj8's and put them in place. It made a nice difference.