At your budget I would steer you away from some of the "pedestrian" brands of tubed electronics like: Prima Luna, Schiit, Rogue and a few others that I cant recall. These are not bad products, just not nearly as good as others that cost a bit more. Within your budget you can easily afford separates which will always outperform an integrated. I would put as much money into the components and speakers as you can and then upgrade cables and other tweaks (be careful!) as your budget allows. Fundamental from day one are good acoustic treatments for your room. To suggest almost one third of your initial budget on cables and tweaks is absurd and bad advice IMO. I have limited experience with Atma-sphere preamps but the amps are among the best I have heard given the right speaker impedance.
Help building first tube system.
I am looking to build my first tube system. Small 15 x 15 room, want stand mounted speakers, cd transport, dac and network player, and tube amp/preamp. Would like to stay under $20,000. Not sure where to start? No dealers around me for demo or help. Any advice helps! Thanks.