I'm pretty much getting rid of my Audio equipments including headphones but I'll start with this. This amp comes with four tubes that I bought from eBay and the SMSL Sanskrit 6th gen Dac. I'm not gonna go in detail. I'll just say this that the Rca tubes work extremely well with my HD800's. So they pair well with any headphones with extreme treble.

Price is $300(shipped) for everything and I only accept PayPal.