526

The Tektronix Type 526 Vectorscope, introduced in May 1959, is an instrument designed to measure NTSC color television signals. It was replaced by the 520 in October 1967.

Tektronix 526
NTSC Vectorscope Tek 526 Produced from 1959 to (?) Manuals Tektronix 526 Manual (PDF) Media:Tek 526 field recalibration.pdf (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Pictures

Block diagram
Front
Phase knob
Top hatch
Inside top
Inside bottom
Behind the front panel