I really don't need another counter. I have Kiethely 776's on both benches. I've been trying to broaden out my test equipment a bit as I'm now pretty much retired and most of my equipment has been focused on RF maintainance and specialized.
Sencore often had novel tricks up their sleeves as productive instruments, not necessarly high end, but features that expedited servicing. It wasn't equipment I encountered much during my career where we either used lab equipment or high end test sets. I've picked up a few pieces and have to admit, their equipment made after the 80's must have gone through a transformation in QC. I'm looking at moving soon and might give a thought to doing some general service work including audio. Some of their analyzers begin to look appealing much as service monitors were to my past profession as well as some of their general test equipment.
From what I gather from a brochure, the ratio function is done with the same input and the unit itself is a single channel that's switched between an audio scaler, direct, and prescaler. The two inputs are one 50 ohm terminated and a high impedance input with a variable sensitivity amplifier/"de-noising" stage. Again, not sure what they're getting at. It's another one of their gimmicks they're famous for. From the few pieces I do own now, you do get to like their instruments and ingenuity with use. They do grow on you.