Not really "integrated" with an input selector, etc... but yah, sort of... I generally connect one source ... an Apple Airport Express, and then stream content from any number of devices the family has handy. I usually include a volume control, though... for a small amp in e.g. a bedroom or office, the control is intended to mostly be set < 50%, so I pay more attention to the grid stopper value on the first stage and think a lot about Miller. But on the 6L6-UL amp I built for my living room, the volume control is squirreled away in the back and intended to be turned up to 100% or just shy of... in that case, Miller is less of an issue. That 6L6-UL amp (which has an input sensivity of 440mVrms for 28.5W/ch) is driven by an active pre-amp (a Parasound 2100), and the volume control is really just a component matching attenuator, if you get my meaning.
This 20-ish W/ch amp that's the focus of this project has two goals: Develop a good circuit that can be used for future AA-100 scavenging activities, and build a nice amp that I can sell to my house remodel architect who went ga-ga over my 6L6-UL amp ... unless I end up really liking it, in which case I will of course keep it for myself
With that in mind, I want to have a reasonably sensitive input so that it can be used in a standalone fashion without a separate pre-amp. But it should also be easily incorporated into a system with an active pre-amp. Make sense?
Anyway, I'm going to spend some quality time with the EF86 plate curves and see what I can come up with (the Philips data sheet gives a lot of canned configurations, but they all seem to have high distortion figures, so I want to do the computation myself as a sanity check). Gain > 120 for the first stage is easily attainable with EF86, which would give me adequate sensitivity with a cathodyne PI and still allow for considerable NFB.