Yellow cardboard bound notebook contains operating information for Tektronix Type 526 Vectorscope. Coverpage picture of unit. Section 1: Characteristics include color-phase vector diagrams, phase, saturation, burst gate, etc. Mechanical characteristics include a cathode-ray tube, graticule, ventilation, and construction. Other attributes include circuit description with block diagrams, maintenence and troubleshooting, calibration, parts lists and ordering info, illustrations, accessories, and rackmounting.