Single input Line-Stage Pre-amp

I have a simple question about a simple product so please no suggestions for pre-amps in general as there are numerous threads about that I can access in the archives. My question is, are there any (many?) manufacturers who are marketing a stone simple, uncompromising, single input / single output line stage pre-amp (exactly like the many such offerings there are in Phono preamps)? In both my two-channel systems I only have a single component I wish to listen to. I don't need the extra space and switching compromises that a multiple input preamp provides. I seem to recall that Decware and perhaps some other DIY kits may offer this, but do any of the high-end manufacturers make something like this...preferably a tube design. I do love my Cary SLP-50A...it's small, has only three inputs and one output, overbuilt like a tank, and sounds fantastic paired off with my SET amps, but just wondering if I could get something even more to the point with just a single input and no switch? Any suggestions?