What is the difference between LS & PS

What is the difference between LS & PS on Audio Research preamplifiers.

Ej. LS9 & PS9 (it's for no tubes on line?)

Thank you
Paulo

pauloramirez04-29-2007 3:34am

andrewdoan Details Discussions Posts This discussion Message User 223 posts 04-30-2007 at 04:25pm Copy Comment URL Report Comment Edit Delete May I add that SP is stereo pre amp with phono on board. SP-L means line stage only ( no phono input).