155-0010-00
The Tektronix 155-0010-00 (M004) is a Tek-made chop divider and blanking chip in a TO-99 can, designed by Les Larson.
The chop divider receives a clock signal from the chop decoder and blanking circuit and counts it down by two for the vertical switch, and by four for the plug-in chop. It also provides a horizontal chop blanking pulse if the horizontal mode switch is CHOP