Audio Research research

I'm wondering if there are any good websites that have info about all of Audio Research's preamps such as hierarchy, model numbers, years produced, features, and basic design/configuration. Any help would be greatly appreciated.

Try this.
Check out - a well organized site.
Good luck!
There is a privately created Audio Research database that has been discussed here before. It is the best you will find. Here's the address: is the best I've found for ARC stuff.