Posts: 16018 Location: New England Joined: October 12, 1999 Contributor Since: October 23, 2016
maybe "R" for "Recorder" (i.e., built-in amp and, perhaps also, speakers) -- and/or a portable?
Info for the A-1200U may be easier to find. Heck, I used to have one of those (heh, come to think of it, I have another one I picked up last fall cheap -- and nonworking).
Docs for the A-1200U at: http://www.hifiengine.com/manual_library/teac/a-1200.shtml