Sad news indeed but I understand he was very ill for some time. Peace be with him. Re dyna, he founded it with his buddy Herb Keroes. There are lots of folks who share Sherod's story I think. The little ST-70s are still recycling through another generation. One of the most standard-classic pieces in tube audio.
dynaco history
This piece is still worth reading 50 years after publication
Ultra Linear
dynaco history
This piece is still worth reading 50 years after publication
Ultra Linear