I am a former ARC employee and would be happy to help you in any way I can. I operate a modification company called Great Northern Sound Co and we do a lot of mods on ARC gear (among other brands). I'm not trying to run an ad here but if I can be helpful with specific questions let me know.
ARC product history (Audio Research)
I'd like to learn more about the manufacturing dates and specifications (not to mention reviews) of ARC's product line, going back some years. Their website is great, but only covers the current line-up. Are there any ARC enthusiast pages out there? Or other good references?