It is US patent 2,357,696 - Curt Singer.
If memory is correct it involves feedback in the side chain signal path so that thump is minimized. The feedback signal is applied from the cathode resistor of the second pair of electron tubes to the cathode resistor of the first.
A simple switch can toggle between normal mode and "turbo" mode.
It makes the rhythm section sound more dynamic in a way like ABBA for example.
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