You are looking at very esoteric amps that don’t do well will low impedance loads and do not have much dampening. I have owned The F5, Aleph J and F6 as well as SET amps (the 18 watt 300b referenced above must be Parallel Single Ended, because a single 300b can only output aroun 9 watts at about 10% THD).
your speakers are anathema to those types of amps. If you really want tubes, you will need something in the push - pull variety. I’ve owned Prima Luna and think they are only ok, but they will drive your speakers. You can look at Audio Research if budget allows.
otherwise, you can get different speakers. I own Kef LS50’s and B&W’s and have owned PSB and Salk among others. My favorite speakers are Zu Omens- which work perfectly with those small wattage amps.
your speakers are anathema to those types of amps. If you really want tubes, you will need something in the push - pull variety. I’ve owned Prima Luna and think they are only ok, but they will drive your speakers. You can look at Audio Research if budget allows.
otherwise, you can get different speakers. I own Kef LS50’s and B&W’s and have owned PSB and Salk among others. My favorite speakers are Zu Omens- which work perfectly with those small wattage amps.