Ayon Spirit-1 small tube circuit topology question

I have a friend that is likely to get his first tube amplifier and it looks like it will be an Ayon Spirit-1. I want to help him with a bit of tube rolling for the small tubes. The large tubes are Gold Lion KT88's, so those will stay.

But for the three small tubes, does the one in the front center position split the signal or something and send it to the two in the back?

Also, will the amp use 5814 tubes? If so, I might go with an RCA 5814 in the center spot and some Mullards in the other two positions, but I first need to understand the topology.

Thanks for any help.