Peachtree Audio, which is distributed by Signal Path, introduced a tasty little 50Wpc digital integrated amp, the Decco ($799). That little window in the front has a 6922 tube behind it, feeding, presumably, a class-D power amp. The Decco has two analog inputs and three digital inputs: USB, Toslink, and S/PDIF coaxial. It decodes MP3, FLAC, AIF, and WAV and even has a slot in the rear to accommodate a Sonos ZP80 WiFi media player. It is also compatible (but lacks slots for) Apple TV and other music servers. There's a preamp output, in case you want to go for more power.
That ought to get your juices flowing.
