Tubes in the preamp, solid state for the amp. It's actually not bad. I currently have it hooked up to Paul Carmody's Classix 2 bookshelf kit speakers. This amp also has pre-outs that could be used for a subwoofer etc. I've tried the Bluetooth and it works well and my phone found it instantly. I also hooked it up to my PC to the analog in with a 3.5mm to RCA Y cord. \n\nWhether the tubes really do anything notable, I can't really tell but, it does sound good. I'm not really a tube guy, and to be honest and since I'm not real big on Bluetooth, for about the same $, I would prefer the Emotiva Basx A-100. \n\nStill, the thing feels like it's well built. I can see it being useful for what it is intended for and for those who like the tube thing. Be a great little bedroom rig with the Classix2 speakers. It plays plenty loud. Tone controls work with plenty of variation with the bass and treble, but the VU meter is more for looks. \n\n\n\nAh well, maybe it will grow on me and I will find it handy for something. If not, I can gift it to one of my kids for Christmas and save myself a trip.