John Hilig at Musical Concepts have been rebuilding and modifying Adcom 535s for over 20 years.
I'm begining to think that one the differences between high end and mass market is the willingness to maintain ones own products or just refering ones products out. High end companies take care of their customers for the life of their products. Mass market companies drop you once the sale is completed. This may signal a new direction for Adcom. Too bad.