Tvad, I am equally curious why you would find my questions curious and do think my question is relevant. I have owned at least 30 line stages or preamps in 40 years involved in audio with probably three quarters of them tube units. I own probably 2000 vacuum tubes mainly as replacements of tubes in those units.
My interest in the Tempo has nothing to do with my satisfaction with the H-Cat. It is just the continuing quest for perfect reproduction. Certainly some 40 years ago when I got a ARC SP-3 preamp, I thought it was perfection, and I did have it for 5 years, only to get a SP-6A which was a piece of crap.
I cannot believe given the experiences of my many friends in audio, that you have the same system today that you had two years ago.