Mcintosh mc275 vs Mac2102

thanks for the response, a big plus of the 275, it's easier to move around

They basically sound the same leaving the slight power factor out. I have had both.
2102 - nice blue meters but hassle of changing bulbs when they invariably burn out; nice binding posts for various speaker cable attachments.
275 - the IV version is wonderful and is directly comparable to the 2102. Limited speaker cable connections but not a major factor. Get a second and use one per channel in monoblock.