For the money, nothing comes close to an EAD classic 5.1 preamp. No its not tube, but it has great features and sound. Pick up a very good used one for under 750. A/D converter, D/A, optical, toslink and rca inputs. RCA and bal out to main speakers. Burr Brown dacs, etc,etc. Call Bolen Electronics and see if they have one or know who does. Ten years ago these retailed for 6995. and are built like it. My two cents.
