Honestly there's isn't really a lot more I can tell ya than the power rating, still no documentation here other than service data, waiting on some documentation for the RQ-3747 model tho.

It's a Sylvania RQ-3748 and the later model RQ-4748 which are basicly the same, there's also the Saba 8280 Quadro which was sold in Germany. I'm currently using a RQ-3748 as my main receiver and working on restoring it as well. There is a somewhat decent pic in my Gallery if you wanna check it out. Anyways, as it's not related to this thread thats enough space for that, but feel free to send me a msg about it either here or on aim/msn/y!/skype!
BTW, I made the avatar from this
ad here.