Newest model( not an upgraded unit) purchased new in April 2017 in excellent condition. It’s among the very finest preamps ever made with an awesome phono section built in. If you are looking at this ad you will know what it is.The Mk II is a total rebuild from the original version including: New Circuit boards and CPU New 24k gold plated glass display New "Pleasure Control" volume encoder New battery technology Upgraded XLR output performance New, higher performing external power supply Upgraded phono stage .