After I've made a setup change, or if I notice some change in sound or other parameter.
For instance, after I had set VTF, I noticed that the arm felt heavy when I was cuing it up by hand. It turned out to be way off, I'm guessing because I may have forgotten to tighten down the counterweight after making an adjustment.
Other than that, set and forget. Even though I can set VTA every time, I don't.
WT Simplex & Audiomods Classic > Aleph Ono, Bel Canto PL1/DAC3 > Pass X1 > X150.5 > DeVore Nines
: Be Ever Wonderful - EW&F :