These are fantastic amps, and really drive anything from your HD800 to a power hungry planar like our ZMF Omni. I got the guys at LTA to change my amp over to this 12SN7 version and I have the power supply as well, its magic. I don't know if it's placebo or the tube upgrade but this 12SN7 version has a lot of natural "weight" and foundation in it's sound. It makes everything extremely satisfying to listen to. This is a fantastic deal as the regular ZOTL with the PSU is $1695. You also gotta factor in all the money you'll save by paying 1/3 price for all the old 12SN7 variants. It's pretty dope awesome. Congrats to MassDrop and LTA for the release of this wonderful ZOTL variant!