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It is a quadrature equalizer for the 1000. The early machines did not have MATC (Monochrome automatic timing control).
The early quad head pole tips were not always in quadrature (90 degrees) with one another. So some method of adjusting the delay of the RF coming off the pole tips was needed. The sliders are variable delay lines and added the necessary delay so all the pole tips outputs would be "together."
Each head reproduced 16 lines of the picture. With no means of correction the picture would appear segmented.
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