Over the years, I have had nothing but exemplary service on my Audio Research and Sonic Frontiers tube gear from Alex Lok, ace technician (35 years of experience)and owner of The Analog Store. What stands out and is uncommon in my experiences with obtaining service for audio equipment is the rapid turn-around time and the meticulous nature of Alex's work. Alex is great to work with and is an enthusiastic supporter of tube/two-channel audio gear. Check out Alex's website:
http://www.theanalogstore.com/
http://www.theanalogstore.com/