Get a Modwright hybrid integrated amp it has 225W into 4 and 400 into 8 but still has a tube buffer in the preamp. It is also under 10k!
tube amps you need big money to get good ones that make modern power.
I mean think about it you are using box speakers you’re not using horns get out of the tube amplifier fantasy unless you’re spending big 100-200k money for VAC monoblocks or switch to horns.