beginner seperate system

Decware Rachael integrates if you fond of SET tube amps. 

Actually, Atma amps are pretty stable for a tube amp. If impedance drops are severe, he recommends using the Zero Autoformers.
Even Steve McCormack says they make his SS amps sound better.
Bob

Hi dcevens,
As for your concern about Don's preamp, if Don should meet with some tragic circumstance after you bought a preamp from him, Roy Muttram, and Bob Latino are loosely connected with him, so I am sure that they would help, but frankly his gear is well built, he doesn't have a lot of issues or else his reputation would be shot. Beyond that, there are plenty of people who have worked with tube gear for years and would be quite capable of repairing his gear if needs be. The ONLY real problems would be parts as he is using transformers and output capacitors from Europe so there would be a time lag as neither currently have US distribution yet.

I didn't do a good job of proofing my original post, when buying tubes, I go through Don, not Roy. Don uses the best new production tubes, some of which are better sounding than NOS tubes. Roy uses lower end tubes IME. Roy designs rock solid gear, but Don Sachs makes improvements in the circuits at times, and he absolutely uses fantastic sounding components.