Will Matney wrote: > Now just to find the last one and what it is. something tells me an > op-amp in a 14 pin dip. The rf input goes to pin 10, and VCC is pin > 14. If anyone can help on this, I'll have it whooped! See if the pin numbers stack up with 710 comparator - that was a popular 'front end' for counters in those days. Steve