Yes we did double check all the wiring and it is correct. I never
considered that the pulse generator could be bad though. I suppose if
there was series resistance to the output and it was exceptionally high
then the output would display on a scope but might be loaded by the
input of a gate. It seems far fetched but I'm not sure what else it
might be. Of course I have no schematic for the pulse generator so I
can't take a look at the output circuit, and Systrom Donner has been
sold / bought out at least twice since this model was made. Lenny.