1740
The Tektronix 1740 is an NTSC waveform monitor/vectorscope for composite and component television signals. Sister models include the 1741 (PAL) and 1745 (PAL/NTSC).
The 1750/1751/1755 are similar, adding SCH and Color Framing Display functions, and the 1760/1761/1765 add Component Vector, Lightning, Diamond, and Bowtie displays on top.