Once upon a time I had all tube systems, and in the early days of CD, tube dacs were a big help, but times change. For well over a decade my system has been 100% solid state
I had a Raysonic 168 which was excellent, BUT, moved up the 228, a 2 box which started glitching after maybe a year. I sent it back to the USD Quest4Sound right at the time that Raysonic was pulling the plug on the company, apparently leaving a lot of unpaid employees. Q4S and I got the runaround.
TMK, no one has manuals or parts to repair them, but they were magical