It looks that nobody has any infos about this unit...
After a lot of g-search I finally found a pic of this item. This tend to confirm it was actually used with (or part of) the AMPEX VR-1000 first tape videorecorder. The pic is a little fuzzy but the unit is clearly identifiable in the right rack cabinet top, and this is the one and only pic which can be found of the web.
BTW, I looked inside the unit and the big linear faders are not (resistive) potentiometers but are driving a multiple tapped coil/cap assembly, very likely an adjustable delay line, or response correction filter.
Last edited by Plumbicon; 05-05-2022 at 04:50 PM.
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