Fritz Carrera 7 Be and 300B power amp?

I owned the Carrera Be's for over three years and used them with a number of different amps both SS and tubes.  The best sound I ever got from them was with a Supratek Chardonnay preamp and a Music Reference RM-10 tube amplifier. 

Going by specs alone a (apparently fairly easy load) 87dB sensitive speaker paired with a no more than ~8W 300B-based SET wouldn’t wring out the most of such a combo. You could no doubt attain great sound in moderately sized spacings, also at fairly loud SPL’s, but from my chair the real treat of low powered SET’s is using them with very high efficiency, preferably all-horn speakers (i.e.: +100dB sensitivity) where you’re taking advantage of the low distortion and ease of SET’s at fraction of wattages (ideally though I wouldn’t pair SET’s with high efficiency, high power capacity speakers with large diameter, heavy voice coils; these are better off with higher powered SS or tube amps). Driving speakers 15-20dB’s less sensitive - all things being more or less equal load-wise - will require up 100x the amount of power of a given amp, and with only so many wattages from an SET you won’t be using them at their best here. That’s not to say it couldn’t great to your ears regardless, certainly at no more than moderate SPL’s, but you’d be wanting for headroom.

With series crossovers which use much smaller and far fewer parts than regular speaker crossovers, my loudspeakers are very easy to drive with tube amps.  I have 8 push-pull integrated tube amps with EL84, EL34, 6L6, 6550, KT88 & KT90 power tubes with 12 to 80 watts per channel and a 300B amp @ 8 watts, a EL34 single power tube amp @ 5 watts and a Decware EL84 amp with 2.3 watts per channel that drives all of my speakers great in my 14 x 22 ft living room. 

Happy listening...   Fritz

Late to the party but I use a Luxman SQ-10 with these speakers. All I can say is WOW!!! If  using the onboard MM phono preamp or my Whest for MC the sound is outstanding. I also use an Aurender N20 for streaming and a Yamaha CD-S1000 as a transport (connected to the N20) and I cannot tell you how impressed I am with these speakers. I also use a Music Fidelity M6Si when I want to really kick up the volume. I will admit it is a little bright, likely due to the BE tweeter but still, the sound is fantastic. These speakers are keepers. I thought about using an EQ to address brightness but I rolled out my old Klipsch Chorus 2s and problem solved. I may consider a sub one day but as things go, I am very happy with my system and the Fritz speakers.