Welcome!
20 odd years ago I looked hard into flea amps and high efficiency loudspeakers. Found that deep bass takes more power than small amps can deliver, so the SET crowd "learned" to be "allergic" to bass and their speakers were bass weenies. As I believed bass to be fundamental I left the cult behind. Understand that I'm not a bass-head, I'm 66 now and listen at moderate levels to mostly small ensemble jazz, classical, and classic pop. Did own to 7 wpc T-amp that handled above average efficiency speakers remarkably well.
Have ventured into several genres of stereo/audio. Have found tubes to be fussy (easily blown/hard to match), complex (many brands to pick from), and some to be expensive. High efficiency loudspeakers tend to reveal system warts and make listening to quiet passages difficult.
Good luck on your search for satisfaction.