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The Tektronix AVC-20 (Audio Vector Converter) provides stereo audio monitoring capability when installed with an NTSC vectorscope.

AVC-20 accepts stereo audio via XLR inputs, and corresponding NTSC video is looped via the AVC-20, typically to the A input of the vectorscope.

The output of AVC-20 can then drive the B input of the vectorscope to display stereo audio information in various formats.