i've never heard the VA, so can't opine on it. however, i have owned the adcom 750 and it was excellent--it's a nelson pass design which is on a completely different level than adcom's cheaper gtp (preamp w/tuner) models. it had a passive mode which was really transparent and sounded even better than the active mode. that said, other posters make a valid point about the reliability of older gear--i think the models you're looking at are 25+ yrs old--but the 750 is a serious piece.
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