i was wondering about the same thing myself although i was comparing the separate pre and power amps. yes, perreaux uses mosfet. i arived at the same conclusions as sean and redkiwi. i found john ransley at Totally Wired ( NEW Zealand ) very helpful in this regard. he carries both lines and he also exports to other countries. you can contact him at www.totallywired.co.nz.
good luck !
good luck !