A 25-watter for 93 db/watt speakers is not that different from my using 6-watt amps for my 99 db/watt speakers. If you don't insist on extremely high volume output, the J2 will work.
I am a low-powered tube person. I own a pair of Audio Note Kageki (parallel single ended 2a3 tube amp) a custom built pushpull 45 amp, and a custom built 349 pushpull amp (my favorite). I had the First Watt J2 in my system for about two weeks (on loan from a friend). I liked it a lot. While it did not sound quite like a low-powered tube amp, it acquitted itself quite well--it was lively and engaging in ways that I've not heard with most solid state amps. It is a first rate amp at a quite reasonable price.
I am a low-powered tube person. I own a pair of Audio Note Kageki (parallel single ended 2a3 tube amp) a custom built pushpull 45 amp, and a custom built 349 pushpull amp (my favorite). I had the First Watt J2 in my system for about two weeks (on loan from a friend). I liked it a lot. While it did not sound quite like a low-powered tube amp, it acquitted itself quite well--it was lively and engaging in ways that I've not heard with most solid state amps. It is a first rate amp at a quite reasonable price.