kg4wsv, good catch on the ground but the schematic is wrong. I have the t- connected to ground on the MAX6675. Multiple MAX6675's cost a lot more than one ADG609.
If that is correct why is one just like I'm prototyping available on the other side of the earth?
I guess I don't have a clue what and "old school" thermocouple is compared to the one I purchased???
John