I dropped off my 2 Dyna ST70s yesterday (Aug 25 2009). Mike asked me good questions re. history, service, issues. (a good sign).
First impression - A service engineer's service engineer based on his line of questions and his "lab" equipment. It was nice to see a a mix of new and older analog test equipment on his bench. My Dad's Heathkit tube based volt ohm meter would feel right at home on Mike's shop bench. I have built my share of Heathkits and small electronic equipment for an old hobby - long ago (amateur radio WB6YRW - general class). I just don't have time to trouble shoot anymore.
At the time I dropped of my amps Mike was working on a Mcintosh amp.
Mike was very personable. He is a little backlogged (also a good sign) and will be giving me a call next week to give me an update status. He said he should have these units completed by end of next week assuming no transformer issues, which I don't think is the issue.
I will keep this thread posted on the results.