If you want to buy McIntosh stuff look no further than Audioclassics.com, They are the top seller of new and used McIntosh on the east coast! you can buy a preamp from them no problem. Also, Fine Sounds Inc owns McIntosh, Audio Research, Sonus Farber, so it should be fairly easy to find out about these products by calling one place. audioclassics.com there are in Vestal NY.
Matt
Matt