When I bought a Dennis Had "Firebottle" single ended 12wpc tube power amp it was one of the most significant system changes I’d had over many years...including owning other tube power amps...used it initially with a very clean dual mono SS preamp and it sounded astonishingly good, but curiosity meant I had to try a tube preamp and wound up with a Schiit Freya, which when using the tube section, is even better. Not WAY better, it just adds that little extra detail that tubes seem so good at providing. I’m definitely in the tube power amp school of thought simply based on my experience, but tube pre to SS power might fit others just fine.