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[[File:USA Tektronix 521A Front raw.jpg | thumb | 450px | right]] | [[File:USA Tektronix 521A Front raw.jpg | thumb | 450px | right]] | ||
The '''Tektronix 521''' is a PAL vectorscope for analyzing colour video signals. | The '''Tektronix 521''' is a PAL vectorscope for analyzing colour video signals. | ||
* [[Media:521PAL_1970-Catalog.pdf |521 Description from 1970 catalog (PDF)]] | |||
==Manuals== | ==Manuals== | ||