Hey E, loading is the main reason I'm trying an SUT. My phonostage offers plenty of MC gain on its own, however my current cart doesn't seem to get along well with the resistive loading it provides in terms of tonal balance, at any of the available values (including the one recommended by the cart manufacturer). The SUT seems to be an improvement in this regard, even when the nominal impedance product is essentially the same, however there may be losses in other areas. It's been a while since I had any tubes in my amplification chain. (Several years ago there was nothing but, however the phono was the first to go -- too susceptible to annoying and frustrating tube noise issues, no matter what varieties or how many different examples I tried. Maybe an SUT would have helped then.) As far as break-in goes, this manufacturer feels a mere few hours is sufficient for these particular trannies, but I'll give it more than that, as much as I can in the audition period I have.
Ahmad Jamal - "Chamber Music Of The New Jazz" [Argo LP '56]
Illinois Jacquet - "Swing's The Thing" [Verve LP '57]
Johnny Hodges - "The Blues" [Verve LP '57]
Dizzy Gillespie - "Have Trumpet Will Excite" [Verve LP '59]
Junior Mance - "Straight Ahead!" [Capitol LP '64]
The Four Freshman - "...And Five Guitars" [Capitol LP '59]
The Fireballs - "Gunshot!" [Sundazed comp. LP '96]
The Pretty Things - "Singles '64-'68" [Sundazed comp. 2LP '08]