I could be wrong, but as I understand it, running Saga as a passive pre still keeps the tube "live", so tube-life will diminish even when the preamp is used passively. So, the option has only been to burn the tube, or leave it out and have gaping hole and worry about dust and other tidly bits. The LISST should solve the issue. No tube burn, and no potential dust intrusion. Also, some peeps prefer / like / may-want the SS sound.