I have 2 Radiotechnique 12AU7's in my Rogue 99 phonostage.
I found them bright with annoying sibilents (sic?) for many hours.Maybe even up to 100 hours.They have since mellowed very well.I find them to be very revealing (in my system at least)
I found them bright with annoying sibilents (sic?) for many hours.Maybe even up to 100 hours.They have since mellowed very well.I find them to be very revealing (in my system at least)