Compact ~20WPC Tube Amp

I should say 20WPC or more....

I’ve been trying to use a 8WPC 300B SET (Sun Audio) with some vintage bass reflex studio monitors from the 70s (96dB) and it’s clear that I need a bit more power. Everything sounds really awesome but the highs will distort at anything beyond low-medium volume which has been fine but I want to play a little louder sometimes!

Space is limited so I need a stereo amp or maybe small monos are possible.