Yes, that's me! I regret that due to changing jobs around the time that I finished the first pass on the site, I have had very little time to maintain it. Now that I'm retired, perhaps I can go back and clean up a few things that need attention. There is more data that can be shared eventually.
It was my pleasure to talk to several former Dynaco employees and meet a few of them while assembling the data. Jim Elliott in particular was very helpful and put me in touch with both Wade Burns and Ed Laurent. Ed (Dynaco co-founder, designer of the ST70, Mk II/IIIVI and of course the ST120) graciously let me into his home and shared a few stories about the early days of Dynaco; sadly he passed away just a couple of years afterward.
In fact I just looked up my notes from meeting him and found a missing name; Hans Frank was another of the employees who worked on the ST400. I got the impression that there was no "clique" at Dynaco when assigning design details - the people who had the desire and the time to work on something generally were able to contribute. That's part of the reason Wade and Ed were sometimes fuzzy on details of who "designed" a particular piece of gear. They really wanted the best, most economical design they could manage and strongly believed in their company; there was no room for egos.
A couple of weeks ago I visited another company which seems to have the same basic ethos as Dynaco - Magnepan. Several of the founding employees are still there, but all of them committed to quality and value. To my profound astonishment, they are still refurbishing speakers that they made in the 1970s and in fact have my Tympani 1C speakers in for some rework. A complete rebuild hardly costs more than their original list price - and much less in 2017 dollars. Name another manufacturer still providing support for 40 year old speakers; I'll bet there aren't many.
Pretty much all the amplification in my home is Dynaco; one of the reasons I found this thread is that I was going through my basement testing all of the amplifiers and doing any repair or updates needed - such as aging capacitors - and wanted to see what others were doing. It's very satisfying to see how people are still getting use out of these rugged units and making them centerpieces of their stereo systems. I'm sure they'll be working long after I'm gone...