Ohno Schiitizen
1000+ Head-Fier
I have an Asgard 3 and don't find that it runs hot. I have a Vali 2++ that I enjoy, and I might consider stepping up to the Vali 3. You'll see the WE396A tube mentioned a lot but the GE 5-Star 5670 and GE JAN 5670W both sound good and can be had for less. Good luck.
GE JAN 5670W is very good.