i had good luck the first time with two N72s... the one module stopped working after about 4 months (then was lost in the mail getting to SCA for repair, but that's another story)
i powered up N72 #3 just completed, was adjusting the collector voltage and R49 torched. i had something like 23.5 volts showing when this happened, but i think the resistor was already at the bottom.
now what?