Have you ever thought about getting a hybrid amplifier? I’m currently using PS Audio BHk preamp and 300 mono blocks. They have a tube input section and the amps have a Mosfet output section. Plenty of power and warmth.
Tubes and less sensitive speakers
I love the sound of tube amps but I use Maggie 3.7's. I have tried an 45 watt tube amp and while I loved the clarity of midrange, I missed the low end slam, even with a sub. Is there a tube amp out there that matches well with Magnepans? I am using the Hegel H360 and a friend recommended Coda high current amps but I still am thinking tubes.