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Thanks, i think you are right...the original thought train was that the jitter was somehow coming from mains noise...though as i think you would agree, this is unlikely...its more of a scope artefact.

The thing is, why is the jittering not seen with the circuit where the rising edge of the zero cross pulse comes "just after" the zero cross?....or, is that what you were saying about the "just before" one actually being delayed almost a full cycle, and the "long delay"?