My friend owned an Audible Illusions preamp and recently purchased the Primaluna Prologue preamp. The Prima is much more musical, was more open sounding (bigger soundstage) and was just rally nice to listen to. For the $2300 list price, it was a nice addition to his system. Way more musical. I do like the Don Sachs recommendation also. I just built a 6SN7 preamp design although I won't sell it for $1799 starting price like the basic one from Don. It compares nicely to the DHT preamp we also build. You cannot go wrong with either if you like a tube sound versus SS sound. I prefer tubes as you can see as I find SS just a little dry for my old ears.
Happy Listening.
Happy Listening.