I had Omega SAM and while they sounded very good I started to miss not having a tweeter. They were in my second system which wasn’t tube , it was a 40 watt integrated
I thought I would rotate them with my Forte IV which I use a few different amps with. Never got around to that. I did run them with a few PP tube amps but never my 300b. The Omega sounded great but fell apart at moderately loud levels. And that was with several 40 - 50 watt amps.
I sold the Omega and went with a medium efficiency speaker and got a more powerful amp. For that room it was the right choice.
Unfortunately with a 8 watt Amp you are limited to highly efficient speakers. I would look at conventional two ways 93 dB send or more in a small room. Something like a British monitor or Sonus Faber at 86 or so I think will cause any low power amp to run out of steam fast. You only want to use the first watt or less , if you push a 300b to half power you are really asking a lot of it.
I’m 58 and I hear well enough to really miss a tweeter not being there. The Omega claim 18 or 20 k but they are really lacking sparkle. You can’t have everything with a single driver and I’m glad I tried a pair but they ultimately were not for me.

