Rolly,
Sorry, when I said "it just so happens there are 4 saturable reactor. The last unit is the resistance version" I was referring to my first post. In my first post I said there were 5 of the 6970 door operators.
I remember reading one of the tech spec that they were the considered the premier operator from the 50s to the 80s. I use to have an eight bank on a 30+ story in the early 90s. I always thought is was a shame when we ripped them out.
Thanks for the tip on the transistors.
