I use a tubed headphone amp made by Antique Sound Labs called the MG Head. It is a VERY popular little amp. The company that sells them is Divergent Technologies, www.divertech.com . Also if you would like to find more info headphone equipment in gerneral, visit www.head-fi.org or www.headwize.com .I personally use the ASL MG Head and a pair of Sennheiser HD600's. They're an awesome combination. I hope this info helps. Zach
