Evidently you missed my recent questions about this and the limited
responses to them.
I have been working on this very thing. I have (3) 1200 volt SCR's
rated at 90 amps that I am attempting to use in series to trigger a
low voltage coil. Well, low voltage for a TC, anyway. Steve Ward
recommended a way to simultaneously trigger all three SCR's and I am
working on this. I haven't made much progress, yet, because I sold my
O-scope and bought a new one to replace it that I only got in very
recently.
I'll be glad to share what I am doing, if you would like to write to
me off list. If it is okay, I guess I could share what I am doing on
the list. It is on topic.