Beautiful-sounding Red Wine Audio (by Vinnie Rossi) Corvina headphone amp with battery-buffered AC power supply and balanced headphone output for sale.
“The Corvina is the more natural sounding amp. There's an unforced beauty to the sound that's rare in audio; it lets me forget about the electronics and just lose myself in the music. What I'm trying to describe with words isn't easy, but I will say this, you may not notice "grain and edge" in the sound, until you hear an amplifier that doesn't have those irritations [, like the Corvina].” — https://www.cnet.com/news/an-extraordinary-headphone-amplifier-from-red-wine-audio/
The power is buffered through a rechargeable battery inside of the amp. You can also “float” the incoming power to run the amp silently off of pure DC by way of the internal lithium battery (not user-replaceable).
Comes with a Corvina-only XLR to 1/4” TRS headphone socket adapter (made by Vinnie Rossi) and user-replaceable 6922-family NOS (NOS to me, only used about 8-10 hours total so far) Siemens 6DJ8 stereo driver tube.
The amp is very reliable and has a separate power supply that attaches with the included umbilical cable. Feel free to ask me any questions. Thanks very much!