Thanks for the heads up.
The Valhalla 3 page says not to exceed 2.7A total heater current. The two 6SN7s should be around 1.2A if am correct. It is probably at max load between the power tubes and the 6SN7s.
Edit: For the record, this is my first OTL Tube amp, and only my second ever tube amp including the Vali 3. So any pointers, warnings, and/or recommendations are always welcome. 
Good. I think 6SN7s use ~300mA at 6.3V for the heater and <20mA for the anode, each tube total, but the voltage could be different. Seems you have some decent over head as long as the power tubes are stock or equiv
Nice, good to know.
Schiit Audio suggests leaving the power tubes stock (granted I am sure some do not follow this suggestion). Seeing what people have tried in their Vali 3, I suspect some wild tube rolling going on in the near future. 