Who has switched from a PS Audio BHK Preamp to something else?

The AUDIO RESEARCH 6SE also benefits from tube rolling......try some 6N6P in both the power supply and in the other areas where the 6N30 (“Super tube”) are used. Also replacing the 6550 in the power supply can yield positive results ....  The overall effect is for a “Less Lit” sound, but one that sounds smoother, a little more “liquid”, and “dense”, but still maintaining that ARC  sense of transparency that they are famous for, and with no loss of apparent detail and timing (PRAT).....

Cheers