Even though this isn't a tube kit, it is nevertheless a Zen designed kit using Burr Brown op amps and cross feed that sounds more like good tube gear than any other similar product we've heard to date.



Besides a great headphone amp, I often use it as a preamp in front of my Zen Triode amplifiers whenever I use an IPOD as a source.  The combination rivals my tube output CD player in many ways... boy what a way to cheat!

Here is the link to the kit:  https://www.decware.com/newsite/zkit3.htm

Steve  :)