I've been there but not back. ;-) Someone commented about tube hiss and high pitched tone. The slight background hiss is normal for a tube preamp but not the high pitched tone. That indicates to me that one of the tubes is oscillating and needs to be replaced or something else went south in the preamp. I had this happen to me in a CJ PV-12 preamp and replacing the bad tube cured the problem. As for hiss, I've owned three different tube preamps and they all hiss slightly but only noticeable if I place my ear right up to the tweeter. My Adcom GFP-750 preamp is very quiet in the background like most modern ss preamps but it doesn't have the soundstage, air, or transparency of the tube preamps that I have owned.
Currently using ARC LS16 tube preamp in combo with CJ Premier 11a tube amp driving the smallish Thiel CS 1.5 speakers. Previously owned Classe CA-200 ss amp. Good amp with more bass slam but wanted that "tube magic" so I sold it.
Currently using ARC LS16 tube preamp in combo with CJ Premier 11a tube amp driving the smallish Thiel CS 1.5 speakers. Previously owned Classe CA-200 ss amp. Good amp with more bass slam but wanted that "tube magic" so I sold it.