pls1, i think what you saw was a misprint. sp3a1 yes. i once rejected the sp3 because i could detect a slightly fatter bottom than the other preamps we were comparing. its stupid looking for flaws instead of looking for the excellences. now i have an sp3a1 thats in need of restoration, some idiot took a wire cutter to the tone control circuit. its going to take a vacation in minn if the hotel isnt too expensive. a fine sounding unit! it sure woke up my adcom 555II. i can hear the sneering comments now but just use your ears. the 555II is a credible amp. regards.........tr
