however, since ya use a solid-state pre, i'd recommend a toobed fono-stage. no experience w/these... *i* am wery happy w/a pentagon ps-3, a ~$1800 fono-stage that i got at an almost give-away price, cuz no one in the usa has ever heard of it. discovery cable used to carry them, dunno if they still do. while it's solid-state, w/my toobed melos preamp, it's fantastic! the musical surroundings was positively mid-fi in comparison.
all the above said, for ~$1k, ditch the adcom, buy a melos sha-gold reference or maestro, & yule be in fat-city for *all* yer sources - even the fono-stage yure currently using, i'd wager... ;~)
good luck, doug s.