I'm sure we've all had friends with their gazillion dollar stereo systems that used vacuum tubes. Even with the great sound quality, based on the cost, I doubt it we'll ever see a revival for vacuum tube audio/video receivers. Home Theater View does mention:

I seem to have missed this out at CES (and the company is completely quiet on its web site), but AKAI is getting back into surround receivers with a pair of tube receivers. Yes, vacuum tubes. The AVR8500 and AVR8510 are 7-Channel Vacuum Tube Audio/Video Receivers. Both receivers use 7 Dual Triode Vacuum tubes (of "Blue Tube Thermionic" design, whatever that is), one for each amplifier. Tubes actually introduce audible distortion to an audio signal, but the distortion is harmonically pleasing, giving the sound a "warmth" that audiophiles crave.

The amazing part is the price:

No word on availability, but pricing is astonishingly low: $899 for the AVR8500, $1199 for the 8510. I actually think this is a mistake: tube gear is often ludicrously expensive, and, at this point, AKAI no longer has a strong brand in the U.S. home theater market. AKAI could easily create a few limited edition versions of the 85x0 series at much higher price points to build buzz and audiophile credibility.

Read New/Old Audio Technologies New Again: Part One