Another tip of the hat to Jakeru! A job well done, and well documented for the rest of us to use as a resource.

Originally Posted by
jakeru
My temporary fix is to have each circuit drive 2 diodes, both in the same pacakge (to hopefully minimize the change of "thermal runaway", more info on that in a bit.)
Did this entail a trip to the Radio Shack for parts, or did you reuse the original parts?
DaveO
Oxweld oxy acet gear
IMIG 200
PowerTIG 210 EXT... Amazing!